IsaacSaveManager - v2.1.5

• Fix hourglassBackup being nil if continuing a run before save data is created
• Use ipairs instead of pairs for looping through entities
• A Non-rgon hardware-specific issue where the third index of looping through entities will be zero. Fixed by checking for numbers on each loop.
• Fix warnings printing if you used TryGetXSave if it failed and it not printing on the normal GetXSave functions
• Fix game crashing on non-rgon upon exiting the game sometimes
• MC_INPUT_ACTION for some reason runs later than all render callbacks on non-rgon. Added all high-priority render callbacks for non-rgon that'll remove themselves once luamod is successful
• Potential fix for an error that appears when continuing a run on a StageAPI stage