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/app_settings/settings.xml

@@ -86,18 +86,6 @@
 	  <integer>0</integer>
 	</map>
 
-	<key>SianaRenderDeferredInvisiprim</key>
-	<map>
-	  <key>Comment</key>
-	  <string>Support invisiprims in deferred mode</string>
-	  <key>Persist</key>
-	  <integer>1</integer>
-	  <key>Type</key>
-	  <string>Boolean</string>
-	  <key>Value</key>
-	  <integer>1</integer>
-	</map>
-
 	<key>SianaVoidWaterSubdivision</key>
 	<map>
 	  <key>Comment</key>