Migrate all the location status to bits

[brendanheywood]

• 1 = in mdl_files
• 2 = in filedir
• 3 = in remote store

eg change all these:

moodle-tool_objectfs/lib.php

Lines 43 to 61 in d0e7530

	define('OBJECT_LOCATION_ERROR', -1);
	/**
	* Location enum of the object
	* LOCAL is when the object exists locally only.
	*/
	define('OBJECT_LOCATION_LOCAL', 0);
	/**
	* Location enum of the object
	* DUPLICATED is when the object exists both locally, and remotely.
	*/
	define('OBJECT_LOCATION_DUPLICATED', 1);
	/**
	* Location enum of the object
	* EXTERNAL is when when the object lives remotely only.
	*/
	define('OBJECT_LOCATION_EXTERNAL', 2);