merge

Added note on KTX 2.2

REVIEWED: ExportImage()
REVIEWED: ExportMesh()
ADDED: ExportWave()
REMOVED: Internal funcs: SavePNG(), SaveBMP()

NOTE: These changes break the API (parameters order)

Some minor tweaks around

Added a few missing functions to raymath

- Added Vector2MultiplyV
- Added Vector2DivideV
- Added Vector3Divide
- Added Vector3DivideV

Update models.c

fix bug with GenMeshPlane() creating too many vertices/texcoords/normals for the plane mesh

Useful for bitmaps pixelated fonts where anti-aliasing is not desired!
Change also enables additional font generation mechanisms in a future (cleartype, hinting...).

Updated VSCode project to support OSX building / debugging.

Added OSX build tasks

Added OSX launch configurations for debug and release

Fixed included libs for OSX

Added a configuration for OSX

Users will have to specify their personal installation of raylib.

This was causing linker errors on OSX

This requires the user to explicitly specify the path to their raylib folder. We need a better way around this (something like what we do for windows would help).

With the CI system, release directory has not much sense, actually,
every new commit it gets outdated and latest stable release is already
available in GitHub Release tab.

strprbrk() does not follow raylib function name convention but as it is
very similar to the standard strpbrk(), we'll keep the naming... also,
don't like to mix static functions with API functions but as strprbrk()
is just used in the two functions below, it's ok to be there... maybe it
could be refactored in a future or even move the logic inside the
required functions...

core: Support slashes as well in GetFileName & GetDirectoryPath

Noted in #634.

Fixes #634.

lerp for vector2 and float

Fixes path to rlgl.h in README.md

The link to rlgl in the README was broken, it previously pointed to a .c file which doesn't exist (anymore).

Add the remaining numeric keypad keys, and a few other missing ones

Add the plus and minus keys on both the main keyboard and keypad

When a batch reach its vertex limit, a draw call is issued and batch restarted for refilling but if the draw call was issued for vertex data accumulated inside rlPushMatrix/rlPopMatrix, draw call was issued before the rlPopMatrix, consequently modelview matrix was not properly recovered before the draw call... obviously, it only happened the following draw calls, not the first one...

Now it works ok but this system needs to reviewed, noticed and important frames drop when processing around 20 dynamic batch draw calls, it means filling MAX_QUADS_BATCH (8192) quads of data 20 times per frame, including data updating and sending for draw processing.

Doing some maths, it means:
Vertex data (float) -----> 8192 quads * 4 vertex * 3 comp * 4 byte = 393216 bytes
Texcoords data (float) -> 8192 quads * 4 vertex * 2 comp * 4 byte = 262144 bytes
Color data (uchar) -----> 8192 quads * 4 vertex * 4 comp * 1 byte = 131072 bytes

Thats a total of 786432 bytes (0.75MB) sent to GPU 20 times per frame for processing... I'm testing in an Intel HD Graphics integrated, I imagine is too much data to be sent and and it causes stalls, so the frames drop...