Enigma Source (svn, archived)

- fix old API fart message trigger mapping
- rename global variables:
- FrictionFactor to FrictionStrength
- SlopeForce to SlopeStrength
- ElectricForce to ElectricStrength
- reengineering charge stone:
- renaming to st_charge, st_charge_zero, st_charge_plus, st_charge_minus
- attribute "charge", defaults to 0.0, plus equals 1.0, minus equals -1.0,
but no more limited to any specific value range
- charge value can be changed on the fly, but the image shows always the
real sign of the charge
- reengineering items - concerning the new API it is just a renaming:
- it_cherry
- it_banana
- it_squashed
- actors: some code cleanup