Commited changes on branch r1-3-1, please test

Hi all

I committed the following changes (check out branch r1-3-1):

- Fixed remaining const char* gcc warnings.
- Just load ssggraph once to avoid weird crashes when going back to the options
menu and coming back to the race (just the Linux version was affected, and even
this just under special conditions, the Windows version does not work the same
way concerning this) (Bernhard).

Thank you for you feedback.

Bernhard


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