* Update jar_xm.h

Major bug fixes and refactoring

* Update jar_xm.h

update to version 0.31

Operate over global variable

Removed functions from rlgl module.

Avoid RLGL data dependency to allow moving the functions somewhere else

After some investigation, I came to the conclusion it's impossible to get a solution that works for all situations. Fullscreen mode on web depends on the browser, the canvas and also the desired scaling strategy of the user. Just choose a solution that fits me needs for now and let the user manage the canvas on their webs (hopefully not requiring ToggleFullscreen() call).

Also removed several useless related callbacks.

Simplified some parts and reviewed for a correct computation of matrices, considering stereo render view/projection per eye transformations

Use fabsf() instead of abs()

shaders_rlgl_mesh_instanced -> shaders_mesh_instancing

* CheckCollisionPointTriangle

* New feature proposal to existing collision detection routines.
It checks if point [point] belongs to line created between two points [p1] and [p2] with defined margin in pixels[threshold].
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As a bonus, stereo render is compatible with mesh instancing now!

Co-authored-by: Carlos Hernandez Barbera <carloshdezbarbera@gmail.com>