Crash when launching from app on os x due to paths issue

[Riot]

when an app is launched, the working directory is / and attempting to write there throws an exception that our broken exception handling on os x doesn't catch

[Riot]

checking savestate file before trying to read and write, resolves #114

→ <<cset d15ce9dee2dc>>

[Riot]

checking high score file before trying to read and write it, re #114

→ <<cset 14f4175eb332>>

[Riot]

Removing milestone: Beta (automated comment)