v0.07 Alpha 8 Update

+ Added MP7
+ Added Vanilla_Melee for future balancing
+ Added Vanilla_RangedNeolithic, and balanced those weapons. Throwing
spears don't hit harder than Lee Enfields anymore, and arrows don't hit
as hard as gunshots.
+Added Vanilla_Grenades.
+Upped molotov damage to 15 from 10