Simplified example

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

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

`physac` is available on its own repo

This feature is still under consideration/testing and it doesn't work properly, at least the Delay Effect processor.

WARNING: This addition is based on a PR and it's still under review, not sure if it will be maintained in the future. In general, raylib tries to avoid callbacks usage mechanisms.

As prior commit, but complete fix for XBox controller and trigger
buttons too.

> The joystick range is a float from -1 through +1. Casting this to int
> yields only three possible values: -1, 0, and 1. This gives a
> misleading joystick placement in the demo.
>
> By casting to int after the multiplication to get pixel values, the
> demo reveals the analog feel of the joystick.

The joystick range is a float from -1 through +1. Casting this to int
yields only three possible values: -1, 0, and 1. This gives a
misleading joystick placement in the demo.

By casting to int after the multiplication, the demo reveals the
analog feel of the joystick.

* Start 2d lights example.

* finish example

* update image.

* Cleanup render textures

* Fixes to handle shadows on edges that are near to the light better.

* tabs

* move to shapes

Co-authored-by: Jeffery Myers <JefMyers@blizzard.com>

* Add panning to raudio and update audio_raw_stream example.

* remove pan smoothing, code formatting changes following pull request comments

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

Fix typo in link