LLWindow V3 partial merge. Includes Most everything sans new LLMouseHandler which requires some messy changes in llviewerwindow that are best left for a dedicated commit. Also, some translation fluff was skipped for now.

indra/llwindow/llpreeditor.h

@@ -95,7 +95,7 @@ public:
 	// the returned LLWString contains it.
 
 	virtual const LLWString & getWText() const = 0;
-
+	const LLWString & getPreeditString() const {return getWText();}
 	// Handle a UTF-32 char on this preeditor, i.e., add the character
 	// to the contents.
 	// This is a back door of the method of same name of LLWindowCallback.