feat(term): getting/setting console flags (windows) #51

Job	Run time
test (ubuntu-20.04, 5.1)	17s
test (ubuntu-20.04, 5.2)	20s
test (ubuntu-20.04, 5.3)	14s
test (ubuntu-20.04, 5.4)	14s
test (ubuntu-20.04, luajit)	16s
test (ubuntu-20.04, luajit-openresty)	18s
test (macos-11.0, 5.1)	46s
test (macos-11.0, 5.2)	50s
test (macos-11.0, 5.3)	1m 18s
test (macos-11.0, 5.4)	46s
test (macos-11.0, luajit)	45s
test (macos-11.0, luajit-openresty)	43s
test (macos-latest, 5.4)	36s
test (windows-latest, 5.1, msvc)	54s
test (windows-latest, 5.2, msvc)	1m 18s
test (windows-latest, 5.3, msvc)	58s
test (windows-latest, 5.4, msvc)	1m 6s
test (windows-latest, luajit, mingw)	1m 45s
	13m 24s

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