Consolidate headers:
- Group src/common/*.h in src/common/Common.h
- Include all C and C++ standard library headers in q_shared.h
Merge branch 'master' into engine-upgrade/headers
Merge branch 'master' into engine-upgrade/headers

Conflicts:
	src/common/Command.h
	src/common/LineEditData.cpp
	src/common/LineEditData.h
	src/common/String.h
	src/engine/framework/CommandSystem.cpp
	src/engine/framework/CvarSystem.cpp
	src/engine/qcommon/files.cpp
	src/engine/sys/sdl_snd.cpp
Merge branch 'master' into engine-upgrade/headers

Conflicts:
	src/engine/audio/AudioPrivate.h
	src/engine/framework/FileSystem.cpp
	src/engine/rendererGL/tr_animation.cpp
	src/engine/rendererGL/tr_backend.cpp
	src/engine/rendererGL/tr_bsp.cpp
	src/engine/rendererGL/tr_image.cpp
	src/engine/rendererGL/tr_light.cpp
	src/engine/rendererGL/tr_model.cpp
	src/engine/rendererGL/tr_shade.cpp
	src/engine/rendererGL/tr_shade_calc.cpp
	src/engine/sys/sdl_glimp.cpp
Merge tag 'v0.25.0' into archlinux

Alpha 25
Merge branch 'nacl' into engine-upgrade/headers

Conflicts:
	src/common/Command.cpp
	src/common/RPC.h
	src/engine/qcommon/qcommon.h
	src/engine/sys/con_curses.cpp
Fix client build
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