Allow texture loading with no data transfer (in case image.data = NULL)

MAX_DIRECTORY_FILES macro removed.
ClearDirectoryFiles() tweaked to reflect changes.

Now that 4.3 was added this can be enabled with the compile flag.

- All variables are initialized on declaration, some arrays were not properly initialized
 - Static array buffers require memset() for re-initialization on every function call

NOTE: New raylib release installer uses `w64devkit`, smaller and more updated than regular `mingw64-w64` default project. Paths are updated properly.

It was not working properly... recommended to use `nbnet` instead.

Register keys independently of the actions

Reorganized code and added some feature and listed restrictions. Some gltf models do not work yet.

This function is not required, users can check it with `GetGamepadName()`