Use Mouse Input in Commit Tree

[forgottosave]

Mouse Input in Commit Tree

Currently, almost everything in the TUI is clickable and usable with the mouse. This makes it even more confusing, that the commit-tree only supports scrolling, but no clicking of the commits. This should be supported.

Implementation

This is the tricky part, as there are probably many changes that need to be made in how the commit-tree is built and displayed.