Remove usage of power_mod, substituting replace_power instead
Add devhud menu config
Add dev console graphics
Minicore graphics for dev mode
Fix minicore statbars
Don't use aim_assist for melee powers
Add target animation
Merge pull request #430 from dorkster/power_mod

Remove usage of power_mod, substituting replace_power instead
Merge pull request #433 from dorkster/targeting

Turn off aim_assist for melee powers and add a target animation
Merge pull request #432 from dorkster/dev_console

Game data for Developer Mode
Tweak the Averguard Temple door

- The door now displays a message if the player has neither the key nor
the talisman.
- Once the door has been opened, it will stay open. Even after leaving
the map.
Merge pull request #434 from dorkster/alpha_demo

Tweak the Averguard Temple door
Remove some obsolete keys from various data files

Note: maps still complain about 'tilewidth' and 'tileheight'. These are
indeed obsolete, but we should patch the Flare plugin for Tiled before
removing them here. Otherwise, we'll probably add them again by
accident.
Merge pull request #435 from dorkster/cleanup

Remove some obsolete keys from various data files
Remove unused key from npcs/
Merge pull request #436 from mazayus/fixes

Remove unused key from npcs/
Add empyrean_testing maps
Book of the Dead map
Tweak Book of the Dead

- Add collision tiles
- Simplify the eastern edge of the main area. The chest-high walls
caused weird rendering in-game.