Release 2.14.0

ABI summary:

• mirplatform ABI bumped to 26

Enhancements:

• [Wayland] Support screen lockers (ext-session-lock-v1)
• [Wayland] Support drag and drop
• [platforms] Consolidate RenderingPlatform implementations
• [platforms] aggregate multiple Displays into a combined configuration
• [platforms] Drop the dispmanx platform
• [platforms] Drop unused last_frame_on interface
• [Window management] "attached" windows can be "restored" by drag gesture
• [Xwayland] Ensure to call connection_is_allowed on xwayland sessions (partial fix for #2830)
• Add support for cursor drag icons

Bugs fixed:

• [platforms] Handle libinput device rejections better
• [platforms] Assume evdev platform is supported (Fixes: #2837)
• [platforms] Fix naming of outputs on Nvidia cards (Fixes: #2968)
• server/ShmBacking: Fix leak in install_sigbus_handler
• [Wayland] flush display before polling (Fixes: #2902)
• [doc] ignore namespaces that we do not want exported (Fixes: #2365)