Max file extension size set to 16

* add wrap function

* fixed Wrap function wrapping wrong

This reverts commit 81157e4e72.

(GetMouseWheelMoveV).

REDESIGNED: `LoadDirectoryFiles()`
ADDED: `LoadDirectoryFilesEx()`
REDESIGNED: `LoadDroppedFiles()`
ADDED: `IsPathFile()`

This BIG BREAKING change simplifies the functions and gives more control to the user:
 - A new `struct FilePathList` has been added to avoid exposing complex pointers.
 - User is responsible of memory loading/unloading
 - Filepaths loading support recursive directories and file extension filters

* GetMonitorWidth()/GetMonitorHeight(): current video resolution instead max available

* adapt header comment to reflect change

* Unify busy waiting behavior across conditional compilation branches

* Inline busy waiting code instead of using static function

Commit d57c813642 from longlene/cl-raylib now puts
the binding on track with raylib version 4.0.