Implemented "Clear Dying List" tool

Created Tools menu and added an item that clears the dying list and
prompts the user to reset the round number to 1. This allows the user to
quickly set up General for a new D&D session.
Tweaks and Player Manifest work

I removed extraneous question marks from the Add Combatant dialog. I
continued work on Player Manifest, adding a dialog that prompts the user
to type in the player character's name.