Tray callback linux

[A1029384756]

• I confirm that I am the author of this code and release it to the SDL project under the Zlib license. This contribution does not contain code from other sources, including code generated by a Large Language Model ("AI").

Description

• Updates the tooltip creation code to show tooltips properly on KDE
• Adds a new capability parameter to tray callbacks for callback users to better control various codepaths based on platform features
• Mouse coordinates added to callbacks
• Renamed dbus callbacks to match the corresponding dbus signal
• Documented properties that don't match their names on some platforms (specifically Linux)

Known Issues

• No support for the new capabilities + mouse coordinates in callbacks on MacOS
• Untested capabilities + mouse coordinates on windows