Add support for building as shared library and refactor header-only build config #378

Job	Run time
Ubuntu GCC Release	2m 41s
Ubuntu GCC Debug	1m 29s
Ubuntu GCC noexcept Release	1m 49s
Ubuntu GCC noexcept Debug	52s
Ubuntu GCC notime Release	1m 24s
Ubuntu GCC notime Debug	57s
Ubuntu GCC nounity Release	1m 29s
Ubuntu GCC nounity Debug	1m 11s
Ubuntu GCC header-only Release	1m 25s
Ubuntu GCC header-only Debug	1m 7s
Ubuntu GCC shared Release	1m 53s
Ubuntu GCC shared Debug	1m 9s
Ubuntu Clang Release	1m 23s
Ubuntu Clang Debug	1m 10s
Ubuntu Clang noexcept Release	1m 22s
Ubuntu Clang noexcept Debug	1m 0s
Windows 32 Release	3m 34s
Windows 32 Debug	2m 35s
Windows 64 Release	4m 10s
Windows 64 Debug	2m 33s
Windows 64 noexcept Release	5m 20s
Windows 64 noexcept Debug	2m 32s
Windows 64 shared Release	3m 36s
Windows 64 shared Debug	1m 58s
MacOS Release	2m 34s
MacOS Debug	1m 47s
MacOS noexcept Release	1m 53s
MacOS noexcept Debug	1m 33s
WebAssembly Release	4m 27s
WebAssembly Debug	1m 39s
WebAssembly noexcept Release	1m 54s
WebAssembly noexcept Debug	1m 35s
	1h 6m 1s

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