Release 1.15.0 "Feedback loop"

This release adds new layouts, and new types of layout, plus fixes a regular allotment of bugs, and improvs the internal design a whole lot.

Here are the changes that you might notice without digging into code.

Layouts:
- Arabic layout from Khaled Eldoheiri
- Swiss French from Jordi
- Bulgarian from Plamen Stoev
- Swiss German from Patrick Jörg
- Armenian from Norayr Chilingarian
- Wide French terminal from Arnaud Ferraris
- PIN layout

Improvements:
- Integration into GNOME translations
- A debug mode that starts the GTK inspector
- Better errors when can't start
- Better docs (thanks PhilProg)

Bug fixes:
- Unblurred icons
- Not showing on the lock screen for no reason
- Theme changes without restarting now
- Input hint can take effect without having to refocus the field

meson.build

@@ -1,7 +1,7 @@
 project(
     'squeekboard',
     'c', 'rust',
-    version: '1.14.0',
+    version: '1.15.0',
     license: 'GPLv3',
     meson_version: '>=0.51.0',
     default_options: [