fix regex plugin names

[nnmrts]

As far as I understand yaml, loot and the masterlists for the other games, the period before the file extensions needs to be escaped, otherwise a regex like MoreDramaticGravJumps.es[mp] would not only match MoreDramaticGravJumps.esm and MoreDramaticGravJumps.esp but also stuff like MoreDramaticGravJumpsAesp, MoreDramaticGravJumps/esp or MoreDramaticGravJumps-esp, since unescaped . is a wildcard.

[MacSplody]

Thanks.