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gdebugcontroller: Add debug controller API and D-Bus implementation

Philip Withnall requested to merge pwithnall/glib:1190-debug-interface into main

This is intended to provide a uniform interface for controlling whether the debug output from an application (or service) is emitted, typically to journald, but actually to wherever the application chooses to output it.

The main implementation of GDebugController is GDebugControllerDBus, which is intended to be used on Linux. Other implementations may be added in future for other platforms, or larger applications may want to provide their own implementation which integrates with their ecosystem.

The GDebugControllerDBus implementation exposes a D-Bus interface at /org/freedesktop/Debugging with a method to enable or disable debug output at runtime.

This could be used by external harnesses, such as GNOME Builder or systemd, to give a uniform way to get debug output from an application.

Signed-off-by: Philip Withnall

Fixes: #1190 (closed)

Closes #1190 (closed)

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