Add armour constants

also remove Helm Height/Width as it's always equal to the Head
Add GetArmorBust
Merge branch 'master' into patch-armor

Conflicts:
	main.go
Fix merge issue

Forgot the correct url when I merged.
Neaten things up
Add GetArmorBust & GetArmorBody

Phwoar. Hopefully relatively efficient. Will neaten up edges and
implement 1.8 checks for not rendering full armour.
1.8 Armour checks

Also added/updated some comments
Remove a fairly useless function

More efficient in terms of lines to not use a function here.
Merge pull request #132 from minotar/patch-armor

Add Armour rendering for Bust & Body