V2 llmessage merge, incl. llcommon requisites.

Excluded llareslistener, as that appears to only be present for unit-testing
Excluded new SSL methods because, well, they don't work right reliably in v2 for me

indra/llcommon/llliveappconfig.h

@@ -48,7 +48,7 @@ public:
 	~LLLiveAppConfig();
 
 protected:
-	/*virtual*/ void loadFile();
+	/*virtual*/ bool loadFile();
 
 private:
 	LLApp* mApp;