Stun mines

[Dave]

While at it we could make it just as elemental mines (in the past I did a test run on elemental grenades).

We could make 4 new type of mines:

• Electricity (stun, 0.5~1.5s)
• Fire (burn overtime, hp)
• Ice (slow, 2.5~5s)
• Poison (burn overtime, ap)

I'd like to see such thing added.