Changed TextureBrowser filter to case-insensitive.
Extended NonModalEntry to support "changed" callback and to make focus manipulation optional.
TextureBrowser filter entry now won't loose focus after seraching.
Added _filterIgnoresTexturePath and _filterIsIncremental flags for filter in TextureBrowser.
Both default to false.
Turned on _filterIgnoresTexturePath and _filterIsIncremental.
Changed all occurences of "textures/" to GlobalTexturePrefix_get().
Fixed compilation error in MathTest::testTransformation().
Fix for 0003269: "OBJ export comes out broken"
Merge branch 'master' of https://github.com/Zbyl/DarkRadiant
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