featherpad: update to 0.13.0

Packaged by pin in pkgsrc-wip. (The change log below doesn't note this,
but NetBSD-specific patches from pin were also merged in 0.13.0.)

V0.13.0
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* Allow dash and some other characters (-,;!@*') in URL schemes.
* Support syntax color customization, with two separate settings for light and dark color schemes.
* Also added an option for the whitespace color value.
* Never use processEvents(); it makes single-instance apps prone to crash in rare cases.
* Consider the HTML ampersand valid in "&name;", "&number;" and "&hexadecimal;".
* Yet smarter Shift+Enter with alphabetical lists.
* Bypass medium focus stealing prevention.
* Fixed a problem in highlighting of multiline comments (with languages that have regex).
* Fixed highlighting of Markdown code blocks without language.
* Remember cursor's horizontal pixel position before Backspace/Enter and restore it after Down/Up. This feature was removed with Backspace due
to a regression in Qt 5.14.1.
* Found and fixed a potential issue in translations (thanks to Masamichi Ito — ito32bit at GitHub).
* Don't read custom shortcuts and syntax colors from global config files because the user should be able to restore their default values.

V0.12.1
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* Removed "changelog" and "gtkrc" from the language menu (like "srt") while keeping their syntax highlighting.
* Allow searching in the language menu by typing continuously.
* More informative message when a non-text file isn't opened because of preferences.
* Fixed disabled sort line actions in context menu.
* Fixed a case of escaped quote/brace/bracket in YAML.
* Reformat the visible text rectangle on toggling line wrapping.
* Considered the new behavior of horizontal wheel scrolling in Qt 5.14.0.
* Added a workaround for the bug in horizontal scrollbars of Qt 5.14.0.

(gutteridge)