Switch to TOML configuration format

This switches Alacritty's default configuration format from yaml to
toml. While yaml is still supported, it is done by converting it to toml
and should be removed entirely in the future.

All existing features were persisted based on my testing. Behavior
should not change much, though `--option` might have slightly different
behavior since the entire line is not interpreted as one line of toml.

A new `alacritty migrate` subcommand has been added which allows
automatic migration from yaml to toml. This also could be used as a
facility to automatically fix configuration file changes in the future.

Closes #6592.

1 files changed, 1 insertions, 1 deletions

diff --git a/alacritty_config/src/lib.rs b/alacritty_config/src/lib.rs
index 5ed9e1a5..c9d73622 100644
--- a/alacritty_config/src/lib.rs
+++ b/alacritty_config/src/lib.rs
@@ -3,7 +3,7 @@ use std::error::Error;
 
 use log::LevelFilter;
 use serde::Deserialize;
-use serde_yaml::Value;
+use toml::Value;
 
 pub trait SerdeReplace {
     fn replace(&mut self, key: &str, value: Value) -> Result<(), Box<dyn Error>>;