This commit adds parsing of markdown in the chat subheader.
Because of the added complexity performance are impacted but I have
also noticed that on each loading of the chat screen we calculate
alias & identicon through status-go, so that has been changed so that
they are returned from status-go.
Overall performance is now roughly identical, tested loading 150
one-to-one chats.
Another issue that I've spotted is that some `subs` are unnecessarely
recalculated (`active-chats`), when unrelated fields changes. I will
address this in a separate PR that should improve performance.
Signed-off-by: Andrea Maria Piana <andrea.maria.piana@gmail.com>
