New wizard spell: Forge Arcane Golem

Created by: unid15

http://ss13.moe/wiki/index.php/User:Unid/Forge_Arcane_Golem - read more about spell interactions and other stuff here

• Adds a new spell: Forge Arcane Golem. It requires robes to cast and has a cooldown of 20 seconds (purchasing a cooldown upgrade lowers it to 1)
• Casting the spell creates an arcane golem. It's a fragile (50 health), slow creature that's unable to attack. However, it knows all of its master's spells (except Forge Arcane Golem and Mind Transfer), and will cast them together with the wizard, at the same targets if possible. Spell upgrades aren't transferred to golems, except for controlled fireball (unintended but fine feature)
• Only 1 golem can be summoned at once. Purchasing amount upgrades can raise it up to 3. Casting the spell when there are already enough golems summoned will instead teleport all of your golems to your current location.
• The golem will follow the wizard around and won't cast spells on its own. If it dies, all of the wizard's spell will go on cooldown.
• Sprites by @SkowronX

TODO LIST

• Get somebody to sprite a cool sprite for them
• Fix issues that prevent golem from working at all
• Test #