* stackable authentication modules
* tcp wrappers authentication module
* gss, kerberos, ldap and u2f authentication modules
* request access to the session
* pulseaudio server per session to prevent audio leaking
* better network bandwidth utilization and congestion management
* faster encoding and decoding: YUV for webp and jpeg, encoder hints, better vsync
* notifications actions forwarding, custom icons, expose warnings
* upload notification and management
* shadow servers multi window mode
* tighter client OS integratioin
* client window positioning and multiscreen support
* unique application icon used as tray icon
* multi stop or attach
* control start commands
* forward signals sent to windows client side
* forward requests to open URLs or files on the server side
* html5 client improvements: top bar, debugging, etc
* custom http headers, support content security policy
* python3 port improvements
* bug fixes: settings synchronization, macos keyboard mapping, etc
* packaging: switch back to ffmpeg system libraries, support GTK3 on macos
* structural improvements: refactoring, fewer synchronized X11 calls, etc