When building a shared Raylib library on Linux, the build process
produces 3 files: libraylib.so (symlink), libraylib.so.381 (symlink)
and libraylib.so.3.8.1 (the library).

Only the first one of these (.so) is currently ignored by Git.
Adding *.so.* to .gitinore makes Git ignore the rest of them as
well.

I think it is useful to know what the empty behavior is in cases where
you are enumerating key presses (e.g. implementing "press any key to
continue").

* Fix Makefile to build WASM examples.

- Add --preload-file flag before specifying the resource dir
- Add empty resource dir to `shapes/` (otherwise wasm-ld will fail)
- Add wasm outputs to .gitigore

* Delete .gitignore

Co-authored-by: Ray <raysan5@gmail.com>

This reverts commit a8e9e1387f.

Now rlgl uses the `Matrix` type, just make sure it has been previously defined somewhere... I don't like this approach but it's probably the easier one for the users... still looking for a better solution... maybe using something like
`#define MATRIX_TYPE`, so it can be checked in other modules.

rlgl has been redesigned to avoid any dependency to `raylib` or `raymath`, all functions using some of those libs have been reviewed.
 - REMOVED: `Texture2D`, `Shader` structs dependency
 - REMOVED: `Vector3`, `Matrix` structs dependency
 - REMOVED: raymath functions dependency, all required math is implemented in rlgl
 - ADDED: `rlMatrix` custom rlgl type
 - ADDED: `utils.c`: `rlMatrixFromMatrix()` and `rlMatrixToMatrix()` for a safe conversion between raylib<->rlgl matrix types
 - ADDED: `rl` prefix to all `rlgl` structs
 - Other small tweaks here and there

Reorganized models functionality, it still needs some review...

* Unused UWP define removal

* Further removal of unusued UWP defines