Added C++ header-only library generator

cpp/README.md

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+# utf8proc.hpp
+
+Here is a version of the utf8proc library, but made usable in constexpr expressions.
+You just need to include the `utf8proc.hpp` header, and the library is usable.
+(the `fake_libc_headers` is only useful for the generation, not for the usage)
+
+Some differences from the C library:
+- The public entities are not prefixed by `utf8proc_`. Instead, they are in the `utf8proc::` namespace.
+- The private entities (`static` from `.c` files) are in the `utf8proc::detail::` namespace.
+- All entities are constexpr.
+- Allocating entities are not available, because `malloc` is not constexpr.
+  This includes `map`, `map_custom`, and facilities to do normalizations directly on UTF-8 strings (such as `utf8proc_NFKC`).
+  With relaxed rules on constexpr from C++20, it may be possible to allow them.
+
+## Generation
+
+Generation of `utf8proc.hpp` requires Python 3 and [pycparser](https://github.com/eliben/pycparser).
+```
+> pip install pycparser
+> python3 gen_hpp.py
+```
+It may take some minutes (notably the AST building), and then the file was correctly generated.
+
+You may verify it by compiling `main.cpp`.
+Notice that the checks are done using `static_assert` (at compile-time), so if it compiles, it means that the library works.

cpp/fake_libc_headers/_ansi.h

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+#include "_fake_defines.h"
+#include "_fake_typedefs.h"

cpp/fake_libc_headers/_fake_defines.h

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+#ifndef _FAKE_DEFINES_H
+#define _FAKE_DEFINES_H
+
+#define	NULL	0
+#define	BUFSIZ		1024
+#define	FOPEN_MAX	20
+#define	FILENAME_MAX	1024
+
+#ifndef SEEK_SET
+#define	SEEK_SET	0	/* set file offset to offset */
+#endif
+#ifndef SEEK_CUR
+#define	SEEK_CUR	1	/* set file offset to current plus offset */
+#endif
+#ifndef SEEK_END
+#define	SEEK_END	2	/* set file offset to EOF plus offset */
+#endif
+
+#define __LITTLE_ENDIAN 1234
+#define LITTLE_ENDIAN __LITTLE_ENDIAN
+#define __BIG_ENDIAN 4321
+#define BIG_ENDIAN __BIG_ENDIAN
+#define __BYTE_ORDER __LITTLE_ENDIAN
+#define BYTE_ORDER __BYTE_ORDER
+
+#define EXIT_FAILURE 1
+#define EXIT_SUCCESS 0
+
+#define UCHAR_MAX 255
+#define USHRT_MAX 65535
+#define UINT_MAX 4294967295U
+#define RAND_MAX 32767
+#define INT_MAX 32767
+
+/* C99 inttypes.h defines */
+#define PRId8 "d"
+#define PRIi8 "i"
+#define PRIo8 "o"
+#define PRIu8 "u"
+#define PRIx8 "x"
+#define PRIX8 "X"
+#define PRId16 "d"
+#define PRIi16 "i"
+#define PRIo16 "o"
+#define PRIu16 "u"
+#define PRIx16 "x"
+#define PRIX16 "X"
+#define PRId32 "d"
+#define PRIi32 "i"
+#define PRIo32 "o"
+#define PRIu32 "u"
+#define PRIx32 "x"
+#define PRIX32 "X"
+#define PRId64 "d"
+#define PRIi64 "i"
+#define PRIo64 "o"
+#define PRIu64 "u"
+#define PRIx64 "x"
+#define PRIX64 "X"
+#define PRIdLEAST8 "d"
+#define PRIiLEAST8 "i"
+#define PRIoLEAST8 "o"
+#define PRIuLEAST8 "u"
+#define PRIxLEAST8 "x"
+#define PRIXLEAST8 "X"
+#define PRIdLEAST16 "d"
+#define PRIiLEAST16 "i"
+#define PRIoLEAST16 "o"
+#define PRIuLEAST16 "u"
+#define PRIxLEAST16 "x"
+#define PRIXLEAST16 "X"
+#define PRIdLEAST32 "d"
+#define PRIiLEAST32 "i"
+#define PRIoLEAST32 "o"
+#define PRIuLEAST32 "u"
+#define PRIxLEAST32 "x"
+#define PRIXLEAST32 "X"
+#define PRIdLEAST64 "d"
+#define PRIiLEAST64 "i"
+#define PRIoLEAST64 "o"
+#define PRIuLEAST64 "u"
+#define PRIxLEAST64 "x"
+#define PRIXLEAST64 "X"
+#define PRIdFAST8 "d"
+#define PRIiFAST8 "i"
+#define PRIoFAST8 "o"
+#define PRIuFAST8 "u"
+#define PRIxFAST8 "x"
+#define PRIXFAST8 "X"
+#define PRIdFAST16 "d"
+#define PRIiFAST16 "i"
+#define PRIoFAST16 "o"
+#define PRIuFAST16 "u"
+#define PRIxFAST16 "x"
+#define PRIXFAST16 "X"
+#define PRIdFAST32 "d"
+#define PRIiFAST32 "i"
+#define PRIoFAST32 "o"
+#define PRIuFAST32 "u"
+#define PRIxFAST32 "x"
+#define PRIXFAST32 "X"
+#define PRIdFAST64 "d"
+#define PRIiFAST64 "i"
+#define PRIoFAST64 "o"
+#define PRIuFAST64 "u"
+#define PRIxFAST64 "x"
+#define PRIXFAST64 "X"
+#define PRIdPTR "d"
+#define PRIiPTR "i"
+#define PRIoPTR "o"
+#define PRIuPTR "u"
+#define PRIxPTR "x"
+#define PRIXPTR "X"
+#define PRIdMAX "d"
+#define PRIiMAX "i"
+#define PRIoMAX "o"
+#define PRIuMAX "u"
+#define PRIxMAX "x"
+#define PRIXMAX "X"
+#define SCNd8 "d"
+#define SCNi8 "i"
+#define SCNo8 "o"
+#define SCNu8 "u"
+#define SCNx8 "x"
+#define SCNd16 "d"
+#define SCNi16 "i"
+#define SCNo16 "o"
+#define SCNu16 "u"
+#define SCNx16 "x"
+#define SCNd32 "d"
+#define SCNi32 "i"
+#define SCNo32 "o"
+#define SCNu32 "u"
+#define SCNx32 "x"
+#define SCNd64 "d"
+#define SCNi64 "i"
+#define SCNo64 "o"
+#define SCNu64 "u"
+#define SCNx64 "x"
+#define SCNdLEAST8 "d"
+#define SCNiLEAST8 "i"
+#define SCNoLEAST8 "o"
+#define SCNuLEAST8 "u"
+#define SCNxLEAST8 "x"
+#define SCNdLEAST16 "d"
+#define SCNiLEAST16 "i"
+#define SCNoLEAST16 "o"
+#define SCNuLEAST16 "u"
+#define SCNxLEAST16 "x"
+#define SCNdLEAST32 "d"
+#define SCNiLEAST32 "i"
+#define SCNoLEAST32 "o"
+#define SCNuLEAST32 "u"
+#define SCNxLEAST32 "x"
+#define SCNdLEAST64 "d"
+#define SCNiLEAST64 "i"
+#define SCNoLEAST64 "o"
+#define SCNuLEAST64 "u"
+#define SCNxLEAST64 "x"
+#define SCNdFAST8 "d"
+#define SCNiFAST8 "i"
+#define SCNoFAST8 "o"
+#define SCNuFAST8 "u"
+#define SCNxFAST8 "x"
+#define SCNdFAST16 "d"
+#define SCNiFAST16 "i"
+#define SCNoFAST16 "o"
+#define SCNuFAST16 "u"
+#define SCNxFAST16 "x"
+#define SCNdFAST32 "d"
+#define SCNiFAST32 "i"
+#define SCNoFAST32 "o"
+#define SCNuFAST32 "u"
+#define SCNxFAST32 "x"
+#define SCNdFAST64 "d"
+#define SCNiFAST64 "i"
+#define SCNoFAST64 "o"
+#define SCNuFAST64 "u"
+#define SCNxFAST64 "x"
+#define SCNdPTR "d"
+#define SCNiPTR "i"
+#define SCNoPTR "o"
+#define SCNuPTR "u"
+#define SCNxPTR "x"
+#define SCNdMAX "d"
+#define SCNiMAX "i"
+#define SCNoMAX "o"
+#define SCNuMAX "u"
+#define SCNxMAX "x"
+
+/* C99 stdbool.h defines */
+#define __bool_true_false_are_defined 1
+#define false 0
+#define true 1
+
+/* va_arg macros and type*/
+#define va_start(_ap, _type) __builtin_va_start((_ap))
+#define va_arg(_ap, _type) __builtin_va_arg((_ap))
+#define va_end(_list)
+
+#endif
+
+/* Vectors */
+#define __m128    int
+#define __m128_u  int
+#define __m128d   int
+#define __m128d_u int
+#define __m128i   int
+#define __m128i_u int
+#define __m256    int
+#define __m256_u  int
+#define __m256d   int
+#define __m256d_u int
+#define __m256i   int
+#define __m256i_u int
+#define __m512    int
+#define __m512_u  int
+#define __m512d   int
+#define __m512d_u int
+#define __m512i   int
+#define __m512i_u int