Added option to count pages instead of words

Useful for viewing comics or other (??) binary files.
Added partial tags matching using * as a wildcard

Tech note: * gets replaced with .+ and the whole shizzle is parsed as a
regex.
Fixed infopanel bug when not counting words
Fixed bug that reset hotkeys when reloading config
Moved "raw text" var to the metadata dict

Which means it does not have to be passed around through the signals and
is instead easily available wherever the metadata is.
Also, if I ever want to have different values for different entries and
not just profile-wide raw text, things just got easier.
Added hotkey to see filename (F6) when viewing an entry

No path though, just the name. Useful for blacklisting.
Re-implemented the blacklist, now regex only

Fixes #14