Merge tag 'v0.25.0' into archlinux

Alpha 25
Merge tag 'v0.26.0' into archlinux

Alpha 26.
Turret health 190 → 250, price 8 → 10. Armoury price 10 → 8.
Rework burning code. Fire spread should be a bit less aggressive.
Synchronize creep marks and creep effects (e.g. slow) via the config file "creepSize" value.
»give health <amount>« sets health to the given value.

This is my first non-C89-compatible commit to the gamelogic! Yay!
Rework alien health regeneration.

Heal rate changes:
- In the open:       1x (unchanged)
- Inside base:       2x (from 3x)
- Close to teammate: 2x (new)
- On actual creep:   4x (new)
- Close to booster:  8x (from 9x)
Remove film grain and vignette effect
Bump Debian standards version.
Add support for jetpack animations.
Attach jetpack to tag_gear instead of tag_head.
Merge branch 'master' into jetpack
Register the idle animation for jetpack as well
Merge branch 'master' into for-0.27
Merge branch 'jetpack' into for-0.27
Merge branch 'master' into for-0.27
Merge branch 'master' into for-0.27
Use two particle sysetems for jetpack and attach them to the nozzle
Implement RE_LerpTagET and RE_BoneIndex for IQM models
Normalize default values of r_gamma and r_specularScale.