Feature: Announcing rolls

There should be a setting to allow announcing rolls in chat
This setting can be enabled or disabled through a checkbox
When enabled, a dropdown selection of channels should be shown:
- Emote (/e)
- Party (/p)
- Raid (/ra)
- Guild (/g)
Selection and enabled/disabled state should be saved
When enabled, rolls should be announced in the selected channel in the following format:
- "[Name] rolled [result of d20] + [modifier] = [total]"
- Modifiers should be shown with names in parentheses, for example "-2 (First Aid) +2 (Item)"
- Name should be the TRP character first name