v1.40.3.8555+ support and other quirks.

* Now works with v1.40.3.8555 (inlined) and older versions too.
* Added a whitelist of features now rather than a global-enable.
* Refactored some code to use std::optional.
* Linux: Wrote proper hooking function. No unhooking support as it's unneeded.
* Windows: Now uses SafetyHook as we need trampolines.
* Windows: When building for debug, you can see queried features and their caller (return address offset from PMS base address); reverse on your own or query me.

.gitignore

@@ -236,3 +236,4 @@ install_manifest.txt
 compile_commands.json
 CTestTestfile.cmake
 _deps
+*.clangd