Window doors are now breakable

- Window doors currently have 200 health, this can and will change if break ins become too common.
- They still do not have wires, so you can not 'hack' them that way.
- As always, emags still hack open window doors

Changes to the hidden mining room treasures.
- Added quality pickaxes, jackhammers and drills as a possible treasure.
- - Higher quality tools are rarer of course
- - Plasma cutter is possible but rare
- Added a ripley (equipped with a drill and hydrolic clamp) as a possible treasure.
- - There is a chance for the ripley to have a diamond drill instead of a regular drill. 

Modified the resource crate.
- - It no longer always gives you multiple stacks of every mineral.
- - It now gives you a chance to get each mineral based on rarity.
- - The size of the mineral stack is also partly based on rarity.
- - There is a very small chance to recieve nothing in this crate.
- - There is a very small chance to recieve a jetpack in this crate ontop of the metal.

Updated the changelog

git-svn-id: http://tgstation13.googlecode.com/svn/trunk@3696 316c924e-a436-60f5-8080-3fe189b3f50e

code/modules/mining/mine_items.dm

@@ -192,6 +192,7 @@ proc/move_mining_shuttle()
 
 	hammer
 		name = "Mining Sledge Hammer"
+		//icon_state = "sledgehammer" Waiting on sprite
 		desc = "A mining hammer made of reinforced metal. You feel like smashing your boss in the face with this."
 
 	silver