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()`

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.

CONVENTIONS:
  - Functions are always self-contained, no function use another raymath function inside, required code is directly re-implemented inside
  - Functions input parameters are always received by value
  - Functions use always a "result" variable for return
  - Functions are always defined inline
  - Angles are always in radians (DEG2RAD/RAD2DEG macros provided for convenience)

Some functions/values have been deprecated for long time but some mapping was kept for convenience. Some of those mappings have been removed...

Moved outside BeginDrawing()/EndDrawing() to illustrate drawing is happening to an external texture (not screen)

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

* Hotfix for glitchy camera

Super small fix that was causing the camera to glitch every x amount of seconds/pixels. Works much better now, 3/4 lines changed.

* fixed dumb visual studio formatting problems

* Typo fix

Changed "bsasic" to "basic" in the comments.

* Added pixel-perfect camera example

Added pixel-perfect camera example, both the .c file and the cover .png image. The example works with any resolution you want, as long as the ratio stays the same
(ex. 16:9, 4:3) ecc.

* Fixed Typecasts

Fixed compiler errors (implicit conversions)

* Precomputed rectangles, time-based movement and whitespace fix

Moved the source and destination rectangles for the renderTexture into their own variables, modified the animation to be time-based instead of frame-based, fixed the bug with whitespaces.

* Fixed spacing and added more consistency with sinf() and cosf()

* Fixed *= operator spacing

* Added support for additional mouse buttons

* Renamed mouse button enum

Co-authored-by: Lambert Wang <lambert.ww@gmail.com>

* Fix some warnings in examples.

* cleanups from review

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

Vr simulator has been moved to core module and completely redesigned. Now user is in charge of stereo-render fbo and also in full control of distortion shader. Code is a bit more complex but better aligned with other raylib examples.

* Fixing typecast warnings generated by visual studio 2019 in examples.

* Changes to fixes based on feedback

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