mikade <redgrinner@gmail.com> [Wed, 27 May 2015 22:34:11 +0900] rev 10967
- preview generation for rubbers, air-mines, crates, barrels
- add map previews for the other 6 TechRacer maps
- make TechRacer (more or less) work out the box
- randomize map by clicking on preview (when map unspecified)