Post-JAM update v1.1

version 1.1 release notes
- added smoke effect and explosion effect
- fixed airship bug where it would move forever (because the distance to destination did not account for height).
- moved FPS display to lower right to be less intrusive
- fixed bug that 'commence battle' text appeared after resize
- camera transition when switching units
- camera shake when bomb is dropped
- prevent camera from going under terrain