(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

RENAMED: `ClearDroppedFiles()` to `UnloadDroppedFiles()`

RENAMED: `ClearDirectoryFiles()` to `UnloadDirectoryFiles()`

`physac` is available on its own repo

This reverts commit d786af83fc.

* Comparison is always true because finalSample >= 1

* Comparison is always false because keyCount >= 0

Events waiting can be enabled/disabled, it toggles event polling.

* Add support for truncating parser input

* Remove RLAPI from implementations in rlgl.h

This immediately shows log messages when stdout is not connected to a
tty.

Remove line that caused a memory leak

Avoid calling `abort()`, `LOG_ERROR` already manages it. Code looks cleaner now.