Fix 'feat.' regex matching

[Breadn]

Minor change to resolve issue #184, and was something I came across recently as well

Ensures that AutoMod will not flag "invalid" feat. sequences that appear within words/names. Will also now flag multiple counts of violations, even if a field contains a valid feat.

e.g. the following are flagged,

ft. me
feat me
ft me
feat. this, feat you, ft.me   // this was previously considered valid

but not,

feat. me
feat.you
ftlframe
FTN-Remix