Added polish diacritics in non_ascii_equivalents.py

[finem4n]

As in title I've added some polish diacritics and also extended filter tags list

[phw]

Thanks. This is somewhat similar to #387

Extending the tag list that way makes sense to me. The new tags seem to be in line with how the plugin originally was conceived. It probably would be even better to have some configuration for this, but in absence of this I think the extensions as presented here is useful.

What also applies here is my comment on #387 about using Picard's picard.util.textencoding.unaccent function (please see my detailed comment there). This would allow to get rid of the explicit mapping of most accented characters. As I see it the first mapping section can be completely removed then, except for the two letters "Ł" and "ł" (which could be placed under "Misc letters" then.

In the future this will then avoid the need to add additional accented characters, likely there are a few that we still miss.

[finem4n]

Hi. I implemented picard.util.textencoding.unaccent. I did some testing and at first glance it handled more than letters, e.g. ≠ and the L shaped ones, but results were disappointing:
≠ changed to =
Ls changed back to 「 instead of |-
So I left them in CHAR_TABLE as they were before.
As per your suggestion in #387 I renamed function ascii to to_ascii. I couldn't find a better name.
I also bumped version and appended my name in authors section, if you don't mind.
If I have more free time, I'd be willing to step in and add scripting functionality.

[Sophist-UK]

In # 387 Echelon666 has said:

You have to finish it yourself.

@finem4n Konrad Would you be willing to include the extra characters from the other PR taking into account @phw Philipp's comments?

[finem4n]

@Sophist-UK Yeah, sure.
According to wiki one of the transliterations of þ (thorn) is th not p, so I've changed that. I also went with ascii representations of ♥ → ・ instead of minus.

[phw]

Thanks for the update, this looks good to me.

[Echelon666]

What about this:

"č": "c",
"š": "s",
"ș": "s",

unaccent performs this?

[zas]

What about this:

"č": "c", "š": "s", "ș": "s",

unaccent performs this?

Yes.

>>> unaccent("čšș")
'css'

[phw]

Thanks a lot