Save state, load state and next save slot shortcuts are no longer hardcoded.
Fix a typo
Add some defines to separate hardcoded shortcuts from the mapped ones
Control mapper now overrides default shortcuts for saved states related commands
Do not map these keys. They are hard-coded. It just a waste. They are leftover from before finding the proper solution.
Merge pull request #6240 from pal1000/work

Have control mapper override the default shortcut keys for save states related commands. Fixes #6214 .