timeline: add ui_abbrev_name

This is a simple and fast function for abbreviating usernames in the
timeline. If they are too large they make the timeline too wide. We'll
probably need to make this adjustable based on the timeline width, but
this is ok for now.

Changelog-Added: Abbreviate usernames in timelines

src/lib.rs

@@ -4,6 +4,7 @@ mod contacts;
 mod error;
 //mod note;
 //mod block;
+mod abbrev;
 mod fonts;
 mod images;
 mod result;