Add weapon_type keys to fantasycore and alpha_demo items
Replace weapon_type with equip_flags

In addition, the Block power now requires an equipped shield to be used.
Add fantasycore/engine/equip_flags.txt

This file defines printable names for equip flags. These are used when
displaying "Requires a _______" text in power tooltips.
Merge pull request #339 from dorkster/weapon_type

Add equip_flags keys to fantasycore and alpha_demo items