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.h

@@ -58,18 +58,12 @@ public:
 		POOL_SKY,
 		POOL_WL_SKY,
 		POOL_GRASS,
-		POOL_INVISIBLE, // see below *
 		POOL_AVATAR,
 		POOL_VOIDWATER,
 		POOL_WATER,
 		POOL_GLOW,
 		POOL_ALPHA,
 		NUM_POOL_TYPES,
-		// * invisiprims work by rendering to the depth buffer but not the color buffer, occluding anything rendered after them
-		// - and the LLDrawPool types enum controls what order things are rendered in
-		// - so, it has absolute control over what invisprims block
-		// ...invisiprims being rendered in pool_invisible
-		// ...shiny/bump mapped objects in rendered in POOL_BUMP
 	};
 	
 	LLDrawPool(const U32 type);
@@ -126,8 +120,6 @@ public:
 		PASS_SIMPLE = NUM_POOL_TYPES,
 		PASS_GRASS,
 		PASS_FULLBRIGHT,
-		PASS_INVISIBLE,
-		PASS_INVISI_SHINY,
 		PASS_FULLBRIGHT_SHINY,
 		PASS_SHINY,
 		PASS_BUMP,