Regression introduced by recent GTK refactor.
The `glib_recv` macros previously using the passed in expression as the receiver, which was causing a new receiver to be created *every* time an event was received. This caused some peculiar behaviours where some events just never got through if sent too close to each other.
This was most obvious in the `workspaces` module.
Fixes#381
This is a major refactor which updates GTK, GLib and GTK Layer Shell to their latest versions.
GLib channels, previously used for receiving events on the GLib Main Context thread have been deprecated and a new method for running Futures on the main thread has been added instead. This commit also replaces all the deprecated code with this.
As part of the above, a bug was uncovered related to creating the GLib main context inside the Tokio runtime. Spawning of Tokio tasks has been refactored to fix this.
BREAKING CHANGE: Where both textual and image icons are supported, CSS classes have changed to better reflect their targets. `.icon` has changed to `.icon-box` and `.icon` now targets the underlying element. `.label` has been changed to `.icon.text-icon`. This affects icons on the **music**, **workspaces**, and **clipboard** modules.
Resolves#185.
Previously images that could not be located were handled by throwing a
full report error, which incorrectly stated it was an invalid image
*type*.
This changes the image handling to instead log a single-line warning
directly in the image provider code, reducing the error handling
required by each consumer.
Resolves#146.
BREAKING CHANGE: To allow for the `name` property, any widgets that were previously targeted by name should be targeted by class instead. This affects **all modules and all popups**, as well as several widgets inside modules. **This will break a lot of rules in your stylesheet**. To attempt to mitigate the damage, a migration script can be found [here](https://raw.githubusercontent.com/JakeStanger/ironbar/master/scripts/migrate-styles.sh) that should get you most of the way.
Resolves#75.
