Feature: Allow Setting Twitch Ad Countdown Positions

[bsquidwrd]

Having the ability to set the bar location for when Ads are running, and it'd be nice to have a similar ability for setting the Countdown Timer location.
Statically being in the bottom right forces camera/vtuber placement needs to be modified.

Request:

• Grant the ability to utilize the following locations for the "Ad Countdown" position (when enabled)
  • bottom-right (Default)
  • bottom-left
  • top-left
  • top-right