Added a new tab and renamed an existing one

Renamed the "Evocraft" tab on the creative menu to "Evocraft Core".
Added a new creative tab named "Evocraft Vehicles".
Moved ItemMech from "Evocraft (Core)" tab to "Evocraft Vehicles" tab.
Added a new tab

Added a new creative menu tab called "Evocraft Materials": This is for
objects like ingots, metal plates, metal tubes, etc. Essentially, highly
used materials that are used in practically everything.
Added a new tab and changed a graphic

Added a new creative tab called "Evocraft Weapons" for weapons in future
updates (and ammunition).
Also changed the "Evocraft Core" tab's picture to the Mech Platform Base
block.
Added a new tab and added a comment that I forgot

Added a new creative tab called "Evocraft Machines" to contain things
like new furnaces, things like IC2's macerator, etc.
Also added a description to the "Evocraft Weapons" tab. (How could I
forget THAT?) :)
Removed Pointless Comments

Removed some pointless comments, mainly the "Stub Method" ones.