GitLab

Removes some unused dependencies and all instances
of `extern crate`, since it's not needed in Rust 2018
Edition.

We can use get_main_window() with the latest
changes to gtk-rs subclassing.

This isn't really used for development, so it probably
doesn't need to live here in the development repository.

Fixes an issue where devel builds couldn't open
the "Keyboard Shortcuts" menu.

Makes use of derive macros from my gtk4-rs branch
instead of including the macros in-repo.

This is a test of what it needs to be like to re-export
the offset_of macro.

Sets up workspace structure and derive macro
for composite templates.

Create a trait for composite templates that simplifies
what we need to do in `class_init`. This could be abstracted
out into a derive macro later.

Cleans up the API of get() so that it uses
expect, pointing to the caller.

Missed in previous commits

Sets the TemplateWidgets so that we can use the struct
fields instead of get_template_child.

Experiment with composite templates for setting
up user interfaces. This way we minimize the amount of UI
set up within the code.

Use GtkButton's icon name props

Now that there is a libhandy port and bindings
for it, we can use that.

Fixes an issue where the window had a reference
leak that caused the application not to close
when the window closed.

Update runtime version and bundle GTK4

Since most of the libhandy things we needed
has been integrated in GTK4, we can do a
preliminary port.

Part of porting to GTK4

This will allow the app to be available in Phosh and PureOS Store.

Allows for translatable strings in .rs files to be detected.