* Fixed functions Vector2Angle and Vector3Angle

* typo

* Unrolled everything.

Following the pattern in Vector3Normalize.

functions use radians, making this awkward to use.

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)

Replaced: Returns -> Get

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

* Changes to fixes based on feedback

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

* More warning fixes for physics and math

* fix a crash introduced with the warning changed.

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

Removed function from raymath

* Add a function to know if two lines intersect each other and if yes, get the intersection point

* Remove indents

* Rework the declaration of the 'Vector2LineIntersect' function, and add the 'Vector2SegmentIntersect' function

* Remove bad indents

* Fix compilation issues

* Fix compilation error

* Fix compilation error

* Replace keyword '_Bool' by 'bool'

Vector3Reflect exists but not Vector2Reflect. The code is pretty much the same.
I'm not sure what RMDEF does, but I added it to match other function definitions (haven't done much C programming, maybe I'm missing something). Can someone explain to me what it does?

* rlDrawMeshInstanced first attempt

* rlDrawMeshInstanced OpenGL 3.3 and VAO checks

* rlDrawMeshInstanced GetShaderAttribLocation; comments

* example instanced shader

* RLGL_STANDALONE RAYMATH_STANDALONE Vector4

* apply suggested naming changes; add instanced mesh example

* remove orphan variables