Support OEGameCoreOptions for multi-system options and required bios/system files per core (Must rebuild all cores to take effect!)

Options:
OEGameCoreHasGlitches - Compatibility and graphics issues; core is WIP. Shows warning at core launch.
OEGameCoreRequiresFiles - Needs bios or system files. Use OERequiredFiles array of dictionaries.
OEGameCoreSaveStatesNotSupported - Save states are not supported. Disables save UI in HUD.
OEGameCoreSupportsCheatCode - Cheat codes are supported. Enables cheat UI in HUD.
Fix race condition in rom importer.
Fix import issue resolver.
Add debug option to disable system detection for import.
Sort systems in issue resolver by name.