Gives the AI a hud

Conflicts:
	code/_onclick/hud/_defines.dm
	code/_onclick/hud/other_mobs.dm
	code/_onclick/hud/screen_objects.dm
	code/game/objects/items/devices/PDA/PDA.dm
	code/modules/mob/living/silicon/ai/ai.dm
	code/modules/mob/living/silicon/ai/say.dm
	code/modules/paperwork/photography.dm
Two fixes

Double click made non-snowflake, cancel camera exploit patched
Now uses isturf
usr -> user

Conflicts:
	code/_onclick/hud/screen_objects.dm
	code/game/objects/items/devices/PDA/PDA.dm
New Sprites for AI HUD!

Provides a new sprite set for the AI HUD from MrSnapwalk!
Refined the implementation of the AStar algorithm :

*Reorganised and commented used procs for better visibility/maintenance
*Redid the PriorityQueue class
*Changed the euclidian distance to the byond one (so that we don't calculate float and square root when it's not necessary)
*Made the AStar algorithm use the closed list instead of just filling it
*Some optimization in the open list sorting : last entered is first in case of f ties, slightly less tiles are checked now
*Changes the order directions are checked when adding adjacents turfs to make for more 'realistic' path (read less 'drunk pathing' with lots of diagonals)
*Fixed some turfs densities not being check for diagonal movement
*Closed firedoors are now correctly seens as blocked by the algorithm
*Cleanbots now only moves in cardinal directions, like other bots.
*Updated the info text at the beginning of the file a bit
*Absolutely unrelated : simplified the turf.Bless() proc

Conflicts:
	code/__HELPERS/unsorted.dm
	code/defines/procs/AStar.dm
	code/game/machinery/bots/bots.dm
	code/game/machinery/bots/cleanbot.dm
	code/game/machinery/doors/firedoor.dm
	code/game/machinery/doors/windowdoor.dm
	code/game/turfs/turf.dm
Start work in janicart replacement train
Moar work on janicart overhaul
Glowing computers to start

Conflicts:
	code/game/machinery/computer/power.dm
Spacepod enhancements
Added damage to spacepods as well as damage overlays.
Started a framework to allow more than 1 weapon system per spacepod.
Pods turn into fireworks when they reach 0 integrity.

Conflicts:
	code/WorkInProgress/pomf/spacepods/spacepods.dm
	html/changelog.html
Add "can" to VOX vocab

Conflicts:
	tools/vox/voxwords.txt
Merge pull request #273 from ZomgPonies/master

13/07/14 - 2