* Getting ready for 2.1.
* Fixed version.
* Year.
* Manually added line as takase said to.
* Fixed minor issue at takase's behest.
* Dunno where that went.
* Updated to use a function pointer.
* OK, as discussed, adding this manually for now.
* Updated SDL.
* Added in conditional, as detaching will fail with "Operation not permitted" on linux; setsid sets a new process group anyway.
* Added in variable to check detached state on cleanup, so we don't send TERM.
* Update meson.build
- add logic to loop over more lua names (in the future more names might be discovered)
- disable warnings and errors on dependencies
* adding missing includes and checks, correct data types, pointer mess […]
- various functions from string.h were used but never defined
- logic was done across multiple different data types with different signedness, got all of them up to snuff
- give 0 sized array size of 1 (array of size 0 is illegal, but rewriting the code is out of the scope of this commit)
- add preprocessor that marks possibly unused argument as such (does not mean they will get optimized out or anything)
- correctly initialize structs with all data needed
All these were found by generating the project using `meson -Dwarning_level=3 -Dwerror=true`
* remove undefined behavior, correct data types
* Comment manual bit manipulation to be investigated
* check for more edge cases, replace multiple cleanups with goto
* remove system specific includes