Adds 24-bit API for projection encoder/decoder #666

Job	Run time
CMake MINGW	1m 6s
CMake/Android/So/ARMv8/Release	1m 17s
CMake/Android/So/X86/Release	17s
Test build with CMake 3.16.0	1m 18s
CMake/Android/So/X64/Release	17s
CMake/Windows/Dll/X86/Release	1m 19s
CMake/Windows/Dll/X64/Release	1m 14s
CMake/Windows/Dll/ARMv8/Release	1m 22s
CMake/Linux/So/X64/Release	33s
CMake/MacOSX/So/X64/Release	39s
CMake/MacOSX/Framework/X64/Release	1m 18s
CMake/iOS/Dll/arm64/Release	47s
CMake/iOS/Framework/arm64/Release	33s
CMake/Windows/Lib/X86/Release	2m 9s
CMake/Windows/Lib/X64/Release	2m 5s
CMake/Windows/Lib/armv8/Release	1m 16s
CMake/Linux/Lib/X64/Release	1m 5s
CMake/MacOSX/Lib/X64/Release	1m 31s
CMake/iOS/Lib/arm64/Release	35s
CMake/Android/Lib/ARMv8/Release	31s
CMake/Android/Lib/X86/Release	32s
CMake/Android/Lib/X64/Release	38s
CMake/CustomModes/Linux/Lib/X64/Release	1m 5s
CMake/AssertionsFuzz/Windows/Lib/X64/Release	1m 53s
CMake/AssertionsFuzz/Linux/Lib/X64/Release	1m 9s
CMake/AssertionsFuzz/MacOSX/Lib/X64/Release	1m 21s
	27m 50s

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