This fixes an issue where all CLI environment variables would replace
existing configuration file variables instead of merging the two maps
together.

Fixes #7618.

This fixes an issue with the default `SerdeReplace` implementation where
it would never recurse through options but always replace the entire
option with the new value.

Closes #7518.

This is only an update to the development versions and does not
represent a stable release.

This patch applies all breaking and non-breaking dependency updates
and bumps MSRV to 1.70.0.

This patch updates the license field to follow the SPDX 2.1 license
expression standard.

The main highlight of this update is that alacritty will now use new
keyboard API from the winit, which resolves a lot of issues around
key bindings, such as ability to bind dead keys. It also fixes long
standing issues with the virtual key code bindings and make bindings
in general more predictable. It also makes our default Vi key bindings
fully working.

Given that alacritty was using `VirtualKey` directly in the bindings
from the winit, and winit simply removed the enum, we've added internal
conversions to minimize the fallout, but new way to specify the bindings
should be more intuitive.

Other part of this update fixes some forward compatibility bugs with the
Wayland backend, given that wayland-rs 0.30 is fully forward compatible.
The update also fixes weird Maximized startup issues on GNOME Wayland,
however they were present on any sane compositor.

Fixes #6842.
Fixes #6455.
Fixes #6184.
Fixes #5684.
Fixes #3574.
Fixes #3460.
Fixes #1336.
Fixes #892.
Fixes #458.
Fixes #55.

This fixes a regression introduced in bd49067 which broke the override
of configuration file variables using `alacritty msg config`.

To fix this the `replace` functionality was rewritten to behave more
like the `serde_utils::merge` where entire values are inserted into the
existing structure rather than separating the keys from the values.

Fixes: bd49067 (Switch to TOML configuration format)