Further header cleanup and a few updates

Updated llstring to current linden
Further linden_common cleanup
Header cleanup
Raised banlines to 5000 as per linden server change
Included missing llmediaentry.cpp file
Minor whitespace changes here and there

indra/llmessage/llfiltersd2xmlrpc.cpp

@@ -80,7 +80,6 @@
 
 #include "llbuffer.h"
 #include "llbufferstream.h"
-#include "llfasttimer.h"
 #include "llmemorystream.h"
 #include "llsd.h"
 #include "llsdserialize.h"