improve assignment of release date

There were a lot of shows that weren't being properly matched up to
anilist because of extra colons and a slight difference in title.
Changed the method of matching so that all unimportant characters are
removed (including spaces) and the titles are deemed matched even if
they just contain each other starting from the beginning. This shouldn't
cause any significant conflicts because shows with actual release dates
with the same name but different ending are unlikely to be running at
the same time.

Fits my needs better because all the shows I'm watching now list a
release date.