The config values are hardcoded atm.

This adds the `\` character to the list of characters which will
terminate matches in Alacritty's default hint for URL recognition.

This patch removes the `hold` option on `alacritty_terminal` in favor of
a `drain_on_exit` option, which will drain the PTY before shutdown. The
hold logic is instead handled in `alacritty`.

The daemon without socket is not that useful.

This cleans up context managing.

Use context robustness to get notified about GPU resets
and try to recover from them by rebuilding the rendering
pipeline.

The wide char spacers must not be drawn, like we do for regular wide
characters.

Sometimes points could end up outside of viewport, thus the screen
will need to be invalidated. The default unwrapping does handle both
cases.

Fixes: a1ed79bd2c01 (Fix highlight invalidation on grid scroll)

Fixes #8337.