6.5 is finally done! Mupen64Plus-Next is fixed, and 19 more cores have been added!

Changelog list:

• 19 NEW CORES!!!
• better core selection
• installable PWA + file handler
• fix scaling problems
• pointerlock options
• better menubar + dark theme
• pre-start core options
• fix broken iframe inputs
• remove default controls list
• add back some shaders
• reset, fullscreen buttons
• standalone html file

For a complete list of changes, see this commit.