ui: introduce profile picture widget

We are starting to use profile pics in different places, let's make it a
widget. We'll also probably need to have adjustable sizes and such soon.

Signed-off-by: William Casarin <jb55@jb55.com>

src/ui/profile/mod.rs

@@ -1,3 +1,5 @@
+pub mod picture;
 pub mod preview;
 
+pub use picture::ProfilePic;
 pub use preview::ProfilePreview;