Fix Whip in Character Builder

[thoth-process]

Currently, the Whip is partially in its own Weapon Group. Its description still shows the description of the Flail weapon group, which it is no longer part of. However, the Whip weapon group itself is not defined, nor are there options for the Whip in most of the other things (e.g. feats) that use weapon group.

ToDo:

• Update Whip Description to remove "Flail" group text and add "Whip" group text
• Define Whip Weapon Group
• Define Arena Weapon Whip Category
• Define Weapon Focus (Whip), Weapon Expertise (Whip), and Versatile Expertise (Whip).