New Features:
- hero added: Sid Meier
- new chip type: CLK
- two more levels: 27, 28
- new setting 'use large game elements'

Bugfixes:
- during the stage intermezzo, the game state was not restored correctly
- tapping area of attackers was too small on high-res screens

Miscellaneous:
- changes in the hero 'tech tree'
- changed appearance of speed control buttons
