New engine version 8779

New features:

-More stable SDL2 port.
-New character select screen
-Characters locking/unlocking support for LGS
-Tons of crash/bugfixes
-String support for LGS
-New runtime dump debugging feature for LGS
-Texture loading now does not stop the main thread, so no slowdowns to load textures.
-Speedup due to optimizations.