Add support for Attacks

[Morgul]

On the DnD4e character sheet page, add the ability to create/edit 'attacks'; basically named die rolls with bonuses pre-calculated for you.

The reason this isn't simply a named die roll is because we want to store the attack and the damage together, in an easy to view manner.

Must include:

• Name
• Attack roll (with an input field for situational bonus/penalty)
• Damage roll (with an input field for situational bonus/penalty)
• Ability to see where your attack/damage bonus came from

Update:

Here's an initial layout for an 'attack':

[Morgul]

This has been supplanted by the dnd4e_simp system