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/cmake/CEFPlugin.cmake

@@ -37,4 +37,9 @@ elseif (DARWIN)
        )
 
 elseif (LINUX)
+    set(CEF_PLUGIN_LIBRARIES
+       llceflib
+       cef_dll_wrapper
+       cef
+    )
 endif (WINDOWS)