added dithering to input signal #630

Job	Run time
CMake/Android/So/ARMv8/Release	36s
CMake MINGW	45s
CMake/Android/So/X86/Release	37s
CMake/Android/So/X64/Release	26s
Test build with CMake 3.16.0	1m 7s
CMake/Windows/Dll/X86/Release	55s
CMake/Windows/Dll/X64/Release	56s
CMake/Windows/Dll/ARMv8/Release	1m 25s
CMake/Linux/So/X64/Release	31s
CMake/MacOSX/So/X64/Release	32s
CMake/MacOSX/Framework/X64/Release	1m 15s
CMake/iOS/Dll/arm64/Release	32s
CMake/iOS/Framework/arm64/Release	40s
CMake/Windows/Lib/X86/Release	2m 35s
CMake/Windows/Lib/X64/Release	2m 18s
CMake/Windows/Lib/armv8/Release	1m 6s
CMake/Linux/Lib/X64/Release	1m 3s
CMake/MacOSX/Lib/X64/Release	1m 18s
CMake/iOS/Lib/arm64/Release	34s
CMake/Android/Lib/ARMv8/Release	33s
CMake/Android/Lib/X86/Release	1m 3s
CMake/Android/Lib/X64/Release	1m 16s
CMake/CustomModes/Linux/Lib/X64/Release	1m 17s
CMake/AssertionsFuzz/Windows/Lib/X64/Release	2m 24s
CMake/AssertionsFuzz/Linux/Lib/X64/Release	1m 13s
CMake/AssertionsFuzz/MacOSX/Lib/X64/Release	1m 20s
	28m 17s

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