[Performance] Character bind is now bulk saved

[Akkadius]

This PR combines individual character_bind queries during Save() into one

This also fixes a long time bug where character heading is not being properly saved in bind

  Zone |   Query    | QueryDatabase DELETE FROM character_bind WHERE id = 1 -- (5 rows affected) (0.008630s)-- [poair] (The Plane of Air) inst_id [0]
  Zone |   Query    | QueryDatabase INSERT INTO character_bind (id, slot, zone_id, instance_id, x, y, z, heading)  VALUES (1,0,189,0,18.000000,-147.000000,20.000000,192.000000),(1,1,29,0,-456.000000,560.000000,-26.000000,192.000000),(1,2,29,0,-456.000000,560.000000,-26.000000,192.000000),(1,3,29,0,-456.000000,560.000000,-26.000000,192.000000),(1,4,29,0,-456.000000,560.000000,-26.000000,192.000000) -- (5 rows affected) (0.000310s)-- [poair] (The Plane of Air) inst_id [0]