The current output form of `hyprctl devices` is like this:
```
Keyboard at 6f80ad70:
ITE Tech. Inc. ITE Device(8910) Keyboard
rules: r "", m "", l "us,ru", v "", o "grp:alt_shift_toggle"
active keymap: Russian
main: no
```
That is, `Keyboard at` goes _before_ the keyboard name, so looking for `Keyboard at` only makes it skip to the keyboard _after_ the one that the user specified.
gtk requires some chars (<>&"') to be encoded for them to render
properly. `sanitize_str` sanitizes raw strings that have such chars and
returns a properly encoded string
The AButton class is designed as full a substitute to ALabel. The
GtkButton attribute 'button_' is initialized with a label. This
label can the be referenced by the subsequent inheritors of AButton
instead of the GtkLabel attribute 'label_' of ALabel.
For convenience a GtkLabel* 'label_' attribute is added to AButton.
If the button cannot be clicked it is disabled, effectively acting
like its label predecessor.
GtkButton seems to catch one-click mouse events regardless of the
flags set on it. Therefore, 'signal_pressed' is connected to a
function creating a fake GdkEventButton* and calling 'handleToggle'
(for details on this possible bug in GTK see:
https://stackoverflow.com/questions/45334911 )
In accordance with other GtkButtons (i.e. the sway/workspace ones)
set_relief(Gtk::RELIEF_NONE) is called on the 'button_' instance.
