- Lift deployment target to macOS 10.11 and start modernizing code

- Replace MASPreferences with Storyboard implementation (Preferences window)

- Vienna is now notarized (needed by macOS Catalina and later)

- Much improved OpenReader support :
    - sensibly decrease the number of network requests:
        - use single 'mark-all-as-read' requests for marking folders read
        - avoid requesting feeds which haven't been updated
   - work around a blockade put on by Inoreader
   - add ‘hidden’ preference to use specific AppId/AppKey with Inoreader:

       > Each user of Inoreader user is able to define (and monitor) a personal
       > set of AppId / AppKey values through Inoreader preferences located at
       > https://www.inoreader.com/all_articles#preferences-developer
       >
       > To have Vienna use these values instead of the default one, you have to
       > type in Terminal two commands similar to the following:
       >
       >>` defaults write uk.co.opencommunity.vienna2 SyncingAppId 9876543210`
       >>` defaults write uk.co.opencommunity.vienna2 SyncingAppKey JrS2smGyidtsxBOytDN1OWsSPcGURKWR`
       >
       > To get back to the default values:
       >
       >>` defaults delete uk.co.opencommunity.vienna2 SyncingAppId`
       >>` defaults delete uk.co.opencommunity.vienna2 SyncingAppKey`

    - adapt to feed identifiers used by TheOldReader and FreshRSS (numerical Ids instead of URLs)
    - improve feed infos synchronisation between Vienna and servers (feed name, homepage, folder/label)
    - fix a problem with credential input in sync preferences panel
    - improve first authentication on OpenReader server
- Fix feed subscription button in browser view
- Fix some problems with enabling/disabling of menu items and toolbar items
- Trim author names in database
- Update address of ArsTechnica feed
- Update components (FMDB, TRVSURLSessionOperation)
- Modernize code, localization & building tools

__Note__ : this version will upgrade the database ; but the newer version of the database remains fully compatible with all Vienna 3.x.x versions. So there is no reason to fear upgrading, or at least testing this 3.5.6 version.

- Fix sizes of cells in Unified view

- Fix our own RSS URL
- Fix multiple problems with input and encoding of OpenReader credentials
- fix selection of next unread article through spacebar when the article view is empty
- Update link templates for zh-Hant language
- Update Swift support to version 5
- Udate to Xcode 11
- Update Sparkle version to 1.22
- Improve build system
- Replace deprecated routines
- Fix some problem with processing of localizable strings

__Note__ : this version will upgrade the database ; but the newer version of the database remains fully compatible with all Vienna 3.x.x versions. So there is no reason to fear upgrading, or at least testing this 3.5.5 version.

- Fix dialog sheet handling definition of smart folders with multiple…

… criteria

- Use w3.org feed validator instead of feedvalidator.org
- Modify User-Agent header used for fetching feeds (fix problem with Oxford University Press)
- On macOS Mojave, fix authorization for plugins using AppleScript
- Fix 'Add to Safari Reading List' plugin regarding articles with empty body
- Some improvements to macOS Mojave's dark mode
- Make article list's progress indicators less prominent
- Trim unneeded whitespaces in URLs of new subscriptions
- Optimize builtin images (losslessly reduce size of PNG and JPEG)
- Replace deprecated SDK calls
- Make process and logs more verbose regarding OpenReader server login failures
- Update Swift support to version 4.2
- Optimize Info.plist
- Optimize build

- Fix crash with problematic feed

- Fix parsing of feeds without titles
- Use basic preemptive authentication to work around some servers which do not send 401 challenges
- Fix update of tabs color when window gains/loses focus
- Prevent Vienna from appearing among dedicated browser applications in System Preferences/General
- Fix usability problem with search box
- Add DuckDuckGo and Qwant among options for search box
- Fix Twitter option for search box
- Use https for searching
- Add support for dark mode to Credits
- Fix tooltips in folders tree
- Update Sparkle to 1.21.2, autorevision to 1.21

- Fix behavior when a Javascript attemps to close a tab

- Refactor browser pane / browser dependency
- Update Sparkle to 1.21.1

- Add ‘Open With’ submenu to contextual menu for items in Downloads w…

…indow

- Allow ‘Open’ in Downloads window even when file is not yet fully downloaded (handy for audio files)
- Improve tabs' support of macOS Mojave's dark mode
- Fix fetching of feeds from OpenReader server
- Sync OpenReader feed names
- Fix feed unsubscribes and moves for TheOldReader
- Fix alignment of feed/folders names which are in Arabic
- Fix double escaping on feed title / description in OPML files
- Update development team in About box

- Fix dark mode for horizontal layout

- Improve support of Emoji characters (use CoreText to draw cells)

- Initial adaptations to macOS Mojave's dark mode (work in progress)

- Improve right to left support
- Improve tab bar management ; fix video which continued to play when last tab was closed
- Fix background color of selected folder on OS X 10.9
- Update FMDB to 2.7.5

- Modernize network access (replace ASIHTTPRequest with a wrapper abo…

…ve NSURLSession)

- Fix an encoding issue in localizable strings