Create new map_region_changed action hook

[Tynarus]

Description

As a plugin developer, I expect to be able to hook into an event triggered when the player's map region changes.

Acceptance Criteria

• Add new action hook type player_region_changed
• Call player_region_changed hook whenever the player's current map region changes
• Provide the following output parameters to player_region_changed:
  • player
  • player's previous position (world)
  • player's new position (world)
  • player's previous map region id
  • player's new map region id

Additional Information

Map region is the term used throughout RuneJS for each 64x64 map file area.