Update Character Creation

[Miyoglow]

Adds new class 'Payload' built off of the character-menu-update branch. Tested and works with the latest helix ver.

Combining ix.charmenu.CreatePayload() and ix.charmenu.SendPayload(payload) and the separation of the VGUI into a plugin means it will be very easy to make entirely new character creation menus. Not as easy as 1. 2. 3... but it's a step in the right direction.

With documentation.