-fix bug in cache for atlas import/export

-fix some menus
-fixed bug in out transition curves
-detect and remove file:/// in collada
-remove multiscript for now
-remove dependencies on mouse in OS, moved to Input
-avoid fscache from screwing up (fix might make it slower, but it works)
-funcref was missing, it's there now

core/os/mutex.h

@@ -50,7 +50,7 @@ public:
 
 	virtual void lock()=0; ///< Lock the mutex, block if locked by someone else
 	virtual void unlock()=0; ///< Unlock the mutex, let other threads continue
-	virtual Error try_lock()=0; ///< Attempt to lock the mutex, true on success, false means it can't lock.
+	virtual Error try_lock()=0; ///< Attempt to lock the mutex, OK on success, ERROR means it can't lock.
 
 	static Mutex * create(bool p_recursive=true); ///< Create a mutex