Avoid unloading default shader, raylib will take care of it

Before deleting certain objects, they must be detached from their parents. That's the case for shader objects after linkage to shader program and also for the texture/cubemaps/renderbuffers attached to framebuffers. If objects are deleted before detached, they are kept in memory to avoid accessing deleted data.

Better organized and commented

Also updated raylib Wiki about struct sizes in 32bit and 64bit

Replaced Vector3 by direct values, easier to use and understand

Co-authored-by: Ray <raysan5@gmail.com>

- raylib-cpp
- raylib-lua-sol
- node-raylib
- raylib-js
- raylib-chaiscript
- raylib-squirrel

Co-authored-by: Ray <raysan5@gmail.com>

rlBlendMode() has been added to rlgl to be used on BLEND_CUSTOM. This functionality is exposed to advance users.

In any case, new blending modes could be added if required.

Co-authored-by: max <max.cedercreutz@cetopo.com>

Co-authored-by: codifies <nospam@antispam.com>

When using USE_PTHREADS=1 on libraylib.bc compilation, program requires --shared-memory passed to the linker and despite it compiles, it fails on execution (at least for me).