Rename pos to position in user facing methods and variables

Rename user facing methods and variables as well as the corresponding
C++ methods according to the folloming changes:

* pos -> position
* rot -> rotation
* loc -> location

C++ variables are left as is.

modules/stb_vorbis/audio_stream_ogg_vorbis.h

@@ -67,7 +67,7 @@ public:
 
 	virtual int get_loop_count() const; //times it looped
 
-	virtual float get_pos() const;
+	virtual float get_position() const;
 	virtual void seek_pos(float p_time);
 
 	virtual float get_length() const; //if supported, otherwise return 0