Hexblade History

Hexblade got partially rolled into the core warlock, but some features are missing, so this re-adds:

• Proficiencies for Martial Weapons, Medium Armour, and Shields
• Hex Warrior
• Hexblade's Curse
• Armour of Hexes
• Accursed Specter
• Master of Hexes

This does not give access to the Hexblade Spell list since it doesn't play nicely presenting spells at appropriate levels as a feat.

Due to this being a feat it cannot use class level, so its level requirements only take character level into account. Due to this it should not be taken by multi-classe characters due to miscalculations making features appear earlier than they should.