Mainly a bug-fix release.
The code base was also cleaned up in many places, which should lead to a bunch of performance improvements.
- Add support for 'age' post-filter (issue #1354)
- New github issue templates
- Move async logic from Site to client classes (issue #1342)
- Log errno when failing to set file mod time on unix
- Fix crash when adding empty header in source settings
- Fix page count parsing for Danbooru since switch to Font Awesome (issue #1331)
- Save 'search' when downloading single images (issue #1322)
- Allow to set an user and password to proxy (issue #1350)
- Force thumbnail extension to JPG on GB 2.0 XML (issue #1348)
- Don't change wiki from non-current tabs (issue #1347)
- Make wiki text selectable (issue #1347)
- Fix wiki link parsing (issue #1347)
- Fix crash on startup when not restoring tabs
- Set image count to tag count if coherent with page count (issue #1336)
- Multiple performance and memory usage improvements
- Fix Danbooru parsing with '+' and '-' tag links (issue #1331)
- Use 'max image count' in display and batch downloads (issue #1331)
- Calculate 'max image count' when parsing page tags (issue #1331)
- Don't trust calculated count from tags for image count (issue #1329)
- Add 'grabber' meta-tag for post-filtering (issue #1325)
- Fix JSON API url for Sankaku (issue #1250)
- Fix Zerochan always loading sample images (issue #1317)
- Fix sankaku rating tag count not detected (issue #1312)
- Fix multiple tag conditional filenames (issue #1310)
- Prevent users to choose invalid site apis (issue #1306)