Changelog:

• FEATURE: Huge core code refactoring. Problems with labels, temp folders etc should be eliminated. Smoother UI should be observed too. (glassez)
• FEATURE: Speed graph (Anton Lashkov)
• FEATURE: Add multiple peers in Peers addition dialog. Closes #1563, #2245, #3133, #1419, #3287, #1419 (ngosang)
• FEATURE: Allow to copy all peers with a keyboard shortcut (ngosang)
• FEATURE: Use GeoIP2 database, allows for country resolution of IPv6 peers. It is no longer embedded in the program but downloaded and updated monthly. (glassez)
• FEATURE: Add more "Run External Program" parameters, closes #3053, #238, #1291, #1522. (Chocobo1, glassez)
• FEATURE: Add an option to allow the use of proxies only for torrents. Closes #2701. (pmzqla)
• FEATURE: Detect network interface state changes. It should detect VPN connection resets. (Pawel Polewicz)
• FEATURE: Switch to using c++11 (glassez)
• FEATURE: Automatically add trackers to new downloads. (ngosang)
• FEATURE: You can now choose the path to download for watched folders. (dsimakov, sledgehammer999)
• FEATURE: Switch to Qt5 by default.
• BUGFIX: Fix progress calculation in Content tab. Closes #2639 Closes #2752 (ngosang)
• BUGFIX: Fix label filter. Closes #3429. (glassez)
• BUGFIX: Fix "Run External Program Launches too Early" issue, closes #2107. (Chocobo1)
• BUGFIX: Don't remove torrent contents parent folder, even it is empty. Closes #2244. (Chocobo1)
• BUGFIX: Always apply filter for manually banned IPs. Related #3988. (sledgehammer999)
• BUGFIX: Fix reporting of tracker status. Closes #3101. (sledgehammer999)
• BUGFIX: Don't connect to "any interface" when the configured network interface is missing. Closes #3943, #2741, #1159, #844 and #143. (sledgehammer999)
• BUGFIX: Fix reordering of first column with Qt5. Closes #2835. (sledgehammer999)
• COSMETIC: Add back "qBittorrent" in program updater title, closes #3549. (Chocobo1)
• COSMETIC: Use infinity symbol rather than -1 for nb_connections (pmzqla)
• COSMETIC: Move uTP options to it's own section (Chocobo1)
• COSMETIC: Fix availability bar &;;; progress bar height being too small on high DPI displays (Chocobo1)
• COSMETIC: Fix availability label &;;; progress label clipped on high DPI displays, closes #3237. (Chocobo1)
• COSMETIC: Add tooltips/legend for availability bar &;;; progress bar (Chocobo1)
• COSMETIC: Use theme color for background in PropertiesWidget (Chocobo1)
• COSMETIC: Replace horizontal line with border in bottom panel (Chocobo1)
• COSMETIC: Various visual changes in the side panel. (Chocobo1)
• COSMETIC: Use thin border for transfer list (Chocobo1)
• COSMETIC: Make URL in "Add Torrent File..." clickable. Closes #3928. (Chocobo1)
• COSMETIC: New view for errored torrents. (sledgehammer999)
• WEBUI: Add information in General tab (ngosang)
• WEBUI: Reorder "Super seeding mode" option in right click menu (ngosang)
• WEBUI: Clean up code (ngosang)
• WEBUI: Added labels support. #648 (Felipe Barriga Richards, ngosnag)
• WEBUI: Fix accessing the WebUI through IPv6 (ngosang)
• WEBUI: Bump WebUI API_VERSION to 6.
• WEBUI: Change selected color to differentiate from the progressbar. (Daniel Peukert, ngosang)
• SEARCH: Add "Copy deion page URL" button in search tab. Closes #2371. (pmzqla)
• SEARCH: Add https_proxy env variable. This forces Python to use the HTTP proxy for HTTPS connections. (pmzqla)
• SEARCH: Detect new plugin URL from clipboard (ngosang)
• SEARCH: Update Torrentz trackers (ngosang)
• WINDOWS: Fix german translation of the installer (netswap)
• NOX: Don't ask the user questions in nox build when in non-interactive mode. Closes #3875. (sledgehammer999)
• OTHER: Fixed typos, spelling correction (dartraiden)
• OTHER: Fix need for restart to enable/disable peer countries resolution. (glassez)
• OTHER: Unload the GeoIP db when disabled. (sledgehammer999)
• OTHER: Reduce max value of "Disk cache size" to 1536MB for 32bit. Closes to #4028. (Chocobo1)
• OTHER: Make "Download in sequential order" and "Download first and last piece first" options independent. (glassez)