Put branch name on separate line

[jeremypw]

Fixes #574

Makes current branch visible without excessive sidebar width when both project and branch have long names

[zeebok]

Code looks good. Is this something that needs to be run by UX?

[jeremypw]

@zeebok. Thanks for the review. Not sure if the design change is significant but I'll request a review from UX anyway. I wanted to wrap the text but it doesn't seem possible in SourceList so I had to hard code two lines.

[danirabbit]

I think the newline for the branch name makes sense here, but I'm -1 on making the project name even larger

[jeremypw]

I find it useful to have the project names more prominent and easily readable but maybe I need new glasses ...

[jeremypw]

I have left this project name size slightly increased as it was smaller than the file items before (!). I really think it needs to stand out at least a little. This is how it looks now: