[MESS] Call now and get a free MESSI.

Added the MESSI item in all its glory.
Code cleanup.
[MESS] GUI CONTAINERS AND INVENTORIES

Strange inventory madness.
Clicking outside drops items on ground.
[MESS] Fixed GUI bounds issues.
[MESS] Messing with mess and getting nowhere.
[MESS] HACKING AWAY!
[MESS] Try out new way of implementing the MESS.
[MESS] ITS WORKING!! ITS WORKING!!!!

Fixed all the things.
[MESS] Fewer crashes.

Fixed crash on breaking mess core.
Fixed crash on right clicking messi without core.
[MESS] Its over 2,147,483,647!!

Fixed NBT saving of stacks in inventory.
[MESS] Merge branch 'develop' into feature/MESS

Conflicts:
	src/main/java/nz/co/crookedhill/ggutils/GGUtils.java
	src/main/java/nz/co/crookedhill/ggutils/item/GGUEnderiumRebirth.java
	src/main/java/nz/co/crookedhill/ggutils/item/GGUItems.java
Merge branch 'feature/MESS' into develop