Commit messages that begin with a hash (#) are ignored

[cleavera]

Describe the bug
When using gitui to create a commit, commit messages that start with a # are ignored. This is the default behaviour of git however setting the config value core.commentChar makes the commit message work when using git on the command line, however commiting through gitui the commit message is still stripped out

To Reproduce
Steps to reproduce the behavior:

1. Go to a project and make some changes
2. Open git UI
3. Commit the changes
4. In the commit message dialog, use the message "#5123 test"
5. Go to the log and the message for that commit is blank
6. Make more changes
7. Run `git config --global core.commentChar ";"``
8. Repeat the above steps
9. Same outcome

Expected behavior
The behaviour should match commiting with the command line, where changing the core.commentChar is respected

Screenshots

Context (please complete the following information):

• OS/Distro + Version: Windows 11, 23h2, 22631.3296
• GitUI Version: 0.24.3
• Rust version: 1.75.0

[extrawurst]

should be fairly simple to implement: see 1a1c948

add commit_message_prettify into asyncgit and handle the config loading and forwarding of the configured comment-char

[cleavera]

Thanks very much @extrawurst and @Concelare