* [rlgl] Load cubemap mipmaps

* [rtextures] Only generate mipmaps that don't already exist

* [rtextures] ImageDraw(): Implement drawing to mipmaps

* [rtextures] Load cubemap mipmaps

* Fix examples Makefile for PLATFORM_WEB

* Replace shell with assignment operator

* Replace tab with spaces

This is to align with the behavior of #4369, see #4371 for rationale on
disabling Wayland by default.

Fix input_virtual_controls example to use correct default font sizes

* [rshapes] Remove `DrawRectangleLines()`'s + 1 offset

* ... and replace it with a -/+ 0.5 offset divided by current cam's zoom.

* Remove the panorama cubemap layout, it was not implemented.
Left a todo in the code for some aspiring developer to finish.

* Update raylib_api.* by CI

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