GCam Port: Metzger100 apks

Update alerts: telegram, rss feed, twitter, mastedon

Butchercam_v3.0_Urnyxbased (Metzger100, 2022-04-16, configs)
Butchercam_v2.1_Urnyxbased (Metzger100, 2020-08-28, configs)
Butchercam_v2.0_Urnyxbased (Metzger100, 2020-08-25, configs)
Butchercam_v1.1_Urnyxbased (Metzger100, 2020-07-31, configs)

Legend:
» Bold + red: One of the suggested versions.
» Bold: Known to be stable.
» Normal: Neutral.