add typing indicator support

This adds support for seeing when other's are typing. And also sending typing events ourselves.

An unfortunate downside is the gap at the bottom of the message list when noone is typing. I don't really know how to fix this. A possible approach could be to maybe make the indicator not full width and align it to the right like Neochat does

Left to do: Make usernames in typing list bold. - UPDATE: DONE Maybe clean up the opcode 14 patch a bit - UPDATE: DONE

Closes: #1 (closed)