Major changes:

- wide layout mode

Landscape

See merge request Librem5/squeekboard!216

It will come useful for applying per-kind styling later without having to give each layout a new stylesheet

Without handling transform, the surface was created with the wrong size on rotated displays, causing flicker before the .configure event arrived. With, it will attempt to set the right size from the start.

Renderer improvements

See merge request Librem5/squeekboard!229

The rendering functions become more pure, which, once reached, will allow for better tracking of what they do and easier modularization.

Ci deps

See merge request Librem5/squeekboard!228

There's no need to keep it for a long time, as its only purpose is to feed the test stage

i think in italian "," is better then "?"

See merge request Librem5/squeekboard!224

layouts: Add German keyboard layout

See merge request Librem5/squeekboard!227

Move event handling to Rust

See merge request Librem5/squeekboard!223

This fixes some rendering things which would happen with multiple state-sharing buttons. It also removes some interfaces exposing rows, views, layouts, and buttons, bringing the code closer to removing them from the FFI entirely.

cleanup: Unused types

See merge request Librem5/squeekboard!222

layouts: Simplify fallbackss handling

See merge request Librem5/squeekboard!221

util::Pointer should be suitable for storing key states in bags like pressed_keys

tests: Fix automatic merge

See merge request Librem5/squeekboard!225

The merge tool didn't realize that new files from one branch should have a format adhering to that of another branch.