Add whitespace to improve readability

[rosavi]

Adding some whitespace between each person's messages improves readability of crowded channels and helps to visually separate messages from different users.

Cobbled together mockup, top half with extra padding, bottom half as default:

This is just a suggestion, there might be other/better ways to improve readability

[agronick]

There is some kind of an alignment issue going on there. All the lines should be alligned. I'll try to reproduce that.