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CMake fixes and standardisation ; MSVC fixes #74

Job	Run time
Test Amalgamation	28s
build / WebAssembly Emscripten \| Static Lib \| ANSI \| Multi-thread \| LTO OFF \| FetchContent	1m 37s
build / Win MinGW \| Shared Lib \| ANSI \| Multi-thread \| LTO OFF \| System	1m 21s
build / Win Cygwin \| Static Lib \| Unicode \| Single-thread \| LTO OFF \| FetchContent	4m 50s
build / Win MSVC Latest \| Shared Lib (MD) \| Unicode \| LTO OFF \| Multi-thread \| FetchContent	1m 22s
build / Win MinGW \| Static Lib \| Unicode \| Single-thread \| LTO ON \| FetchContent	1m 31s
build / Win MSVC Latest \| Static Lib (MDd) \| Unicode \| LTO OFF \| Multi-thread \| System \| RTCu	1m 42s
build / macOS Clang \| Shared Lib \| Unicode \| Multi-thread \| LTO ON \| FetchContent	34s
build / Linux GCC \| Shared Lib \| Unicode \| Multi-thread \| LTO OFF \| Vcpkg	29s
build / Linux Clang \| Static Lib \| ANSI \| Single-thread \| LTO ON \| System	36s
build / Win MSVC Latest \| Static Lib (MT) \| ANSI \| LTO ON \| Single-thread \| Vcpkg \| RTC1	2m 31s
build / Linux Clang \| Shared Lib \| Unicode \| Multi-thread \| LTO OFF \| Vcpkg	35s
build / macOS Clang \| Static Lib \| ANSI \| Single-thread \| LTO OFF \| System	30s
build / Linux GCC \| Static Lib \| ANSI \| Single-thread \| LTO ON \| FetchContent	25s
build / Win MSVC 2022 \| Shared Lib (MTd) \| ANSI \| LTO OFF \| Single-thread \| FetchContent \| RTCs	1m 26s
	19m 57s