* core: added `GetMouseDelta()`

Thanks to previousPosition added by raysan it is now possible to create the GetMouseDelta() function.

Returns a Vector2 with the difference between the current and previous position of the mouse in a frame.

Useful for creating camera scrolling, among others.

* Added changes noted by raysan

Avoid possible symbol collisions

RENAMED: MeshBinormals() -> GenMeshBinormals()

Replaced: Returns -> Get

RENAMED: InitAudioStream() -> LoadAudioStream()
RENAMED: CloseAudioStream() -> UnloadAudioStream()

* review collisions ray-box and ray-sphere

* Applied raysan's refactor
Improved GetRayCollisionBox

* Replace GetRayCollisionGround with GetCollisionQuad

* Update example core_3d_picking

* Update example models_loading

* Fixed issues after merge

* remove debug stuff

Co-authored-by: Cry dsch <chris.obo@gmx.net>

Consistency tweak

- RENAMED: RayHitInfo to RayCollision
- RENAMED/REDESIGNED: Multiple Ray collision functions to be more consistent and return RayCollision data -WIP-

Some breaking changes were introduced lately, it's better to note that current version is not 3.7 anymore...

Renamed for consistency with other function in raylib.

REMOVED: DrawBillboardEx()

* Redesigned billboards - added rotation/pro functions

* updated parameters

Co-authored-by: nobytesgiven <nobytesigiven@github.com>

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

* Added support for additional mouse buttons

* Renamed mouse button enum

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