[client] added new feature input:rawMouse for RAW mouse input

This option allows those that want it (gamers) to bypass all X11 mouse
acceleration and smoothing giving true 1:1 input to the guest while in
capture mode. Note: only supported for X11!

client/src/main.h

@@ -138,6 +138,7 @@ struct AppParams
   const char * windowTitle;
   bool         mouseRedraw;
   int          mouseSens;
+  bool         rawMouse;
 };
 
 struct CBRequest