Sync with Alchemy, includes much awaited lib updates for Linux

Applies ALCH-420 - Replace all invisiprims with fully transparent texture and remove dead code paths
-ARC no longer takes invisis into consideration.

Syncs some script keywords updates.

Changes all "\n" in llfloaterabout.cpp to '\n' because screw.dat

indra/newview/lldrawpool.cpp

@@ -75,9 +75,6 @@ LLDrawPool *LLDrawPool::createPool(const U32 type, LLViewerTexture *tex0)
 	case POOL_FULLBRIGHT:
 		poolp = new LLDrawPoolFullbright();
 		break;
-	case POOL_INVISIBLE:
-		poolp = new LLDrawPoolInvisible();
-		break;
 	case POOL_GLOW:
 		poolp = new LLDrawPoolGlow();
 		break;