The `View` sturct was mostly a layer of indirection, and the controller benefitted by absorbing the gtk::Application
subclass parts, so now those two are merged into a new gtk::Application subclass.
The pipewire loop now runs without interruption in a second thread and communicates with
the GTK thread via a channel in each direction, instead of checking for events once a second and using callbacks.
This allows changes to appear instantly in the view, instead of having to wait.
The controller still determines the ports media type, but instead of coloring
the port itself, the media type is passed to the constructor, which then colors the port.
struct PipewireConnection is now decoupled from any other components, another component (the controller)
can receive updates by registering a callback.
struct PipewireState has been refactored to a struct Controller.
It still keeps state and manages the view, but now also actively requests updates from the pipewire connection via callback.
This updates all crates to their newest release.
For pipewire-rs, this includes bumping the version to 0.3, which means this comment has to fix a few breaking changes, but nothing big.
0.3 also lets us create and delete remote objects, which will be needed for link creation and deletion.
A bug in gtk4-rs makes the library print errors when accessing an event, this change reduces the amount of errors, as they are only printed when the mouse is over a node now.
