Merge remote-tracking branch 'b/main'

UPBGE: Change project name from Blender to UPBGE

Updated README to reflect project name change from Blender to UPBGE and modified relevant sections.

UPBGE: Fix (from AI) for spindle encryption after merge

because of this commit: 8f6bd04
(not tested)

Merge remote-tracking branch 'b/main'

Revert "UPBGE: Test threading for animsys_evaluate_fcurves"

This reverts commit fa03de2.

It causes issues in some files

Merge remote-tracking branch 'b/main'

UPBGE: Fix compilation

Merge remote-tracking branch 'b/main'

Merge remote-tracking branch 'b/main'

UPBGE: Fix compilation