- 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)
07f3bf8d98a3
Hedgewars.png had a resolution more than twice as high as required; also fixed some (mostly obsolete) code that also contained a typo that would cause a warning/note in clang