Preparation for Release 6.0.0

[slaff]

This issue is created to collect all the tasks we need to do before the 6.0 release.

Source Code

• Update Sming/Core/SmingVersion.h.
• Update Readme.md.
• Merge develop into master.
• Tag the source code in the master branch.
• Add upgrade document

New features

• Update pico SDK to v2.1.0 with RP2350 support #2918
• Implement HardwarePWM class for Rp2040 and update Basic PWM sample #2908
• Add JSON streaming parser and configuration database libraries #2892
• Allow installation on Ubuntu 24.04  #2893
• Add PrintBuffer classes #2873
• Add USB host support for esp32s2(s3), support OTG dual-mode #2922

Improvements

• Fix esp32 multicore lockup #2916
• Fix esp32 event callback serialisation #2913
• Add Message-ID header in email when not set. #2915
• HardwarePWM Esp32 - added assert for max pwm channels #2904
• Update documentation for clang-format #2907
• Add env var SMING_TOOLCHAINS to allow easier change of toolchains ins… #2894
• Improved checking for uninstalled tools for unsupported linux distributions. #2887
• Revise bodyToStringParser to use MemoryDataStream #2881
• Include unicode formatting support for JSON escapes #2880
• Add EEXIST to common host errors, don't fail when creating directories #2878
• Add string escaping to JSON formatter #2875
• Add TaskStat::setOutput to dynamically switch output stream #2923

Bug fixes

• Fix MallocCount for MinGW #2884
• fixed network scan #2906
• Fix/mqtt client empty client name #2898
• Fix esp8266 pwm #2889
• Fix build warnings/errors in C++20 #2883
• Fix conflict with stdc++ operator delete[](void*, size_t) #2877
• dtostrf_p doesn't handle advertised range #2879
• Fix vscode error invalid miDebuggerPath for esp32 #2921

Changes

• Translate common host errno values to standard IFS errors #2874
• Increase esp32 default main task stack size to 16K #2920

Deprecations

• Remove official support for older ESP32 IDF versions: 4.3, 4.4 and 5.0. #2882
• Remove official support for ESP8266 toolchains other than ESP Quick Toolchain.

Breaking Changes

Security

All PRs scheduled for this release can be seen from here

[slaff]

@mikee47 do you think you can add your additions for Pico 2350 partitions and esp32s2 USB before Christmas?

[mikee47]

@slaff I'm going to leave RP2350 partitions for the time being as it's going to be tricky, but the USB stuff yes I'll get that ready.