ShoppaMap: Delete unused/dead code

TechRacer: Remove script parameter “helpDisabled” Pointless since you can quickly toggle help anyway, so supporting this script param only clutters the documentation.

bug #598 - this was kinda entertaining but is, yeah, a bit too weird

Highlander: Rename “mode=orig” to “multiuse=true” and explain the meaning of this scriptparam in mision panel Don't worry, the gameplay of this script param is NOT changed, only its name and documentation.

Change how locale is loaded in frontend, and fix some bugs - Fix some loading errors when locale is C - Fallback mission map description to English

The Specialits: Use gfSwitchHog for hog switching and delete the terrible Lua hacks

Add new game flag gfSwitchHog, enable hog switching at turn start

Change appearance of Art theme in Sudden Death

Lua API: Add Explode function

Improve Sudden Death theming of Eyes and Deepspace

Fix some artifacts in contour of horizont.png of Planes theme

Add icons to background themes; allow to hide themes explicitly by adding “hidden” key to theme.cfg