-Codechange: Deduplicate calls to CreateEffectVehicleRel for vehicle visual effects.

git-svn-id: http://svn.openttd.org/trunk@26745 6aa0318a-3be1-0310-93fa-89fd2396df07
-Codechange: Separate enums for visual effect type and spawning model.

git-svn-id: http://svn.openttd.org/trunk@26746 6aa0318a-3be1-0310-93fa-89fd2396df07
-Feature: [NewGRF] Advanced visual effects with multiple effect sprites independent of spawning model.

git-svn-id: http://svn.openttd.org/trunk@26747 6aa0318a-3be1-0310-93fa-89fd2396df07
-Merge: documentation updates from 1.4 branch

git-svn-id: http://svn.openttd.org/trunk@26748 6aa0318a-3be1-0310-93fa-89fd2396df07
-Update from WebTranslator v3.0:
afrikaans - 47 changes by telanus
hungarian - 50 changes by Brumi


git-svn-id: http://svn.openttd.org/trunk@26749 6aa0318a-3be1-0310-93fa-89fd2396df07