Improve core and GDScript VM multithreading performance#971

DAShoe1 wants to merge 4 commits intoRedot-Engine:4.3Redot-Engine/redot-engine:4.3from

DAShoe1:4.3-improve_core_multithreading_performanceDAShoe1/redot-engine:4.3-improve_core_multithreading_performanceCopy head branch name to clipboard