self.node_to_dict always return a dict

connect the key_press_event in messagetextview so that we know when we press a normal key (a, b, ...) and we can reset last_key_tabs[room_jid] variable

then ask the vcard, and resend a new presence only if avatar has changed

we save the current sha in memory and we update it when we receive the vcard
we re-ask the vcard when we receive a presence with a new sha

new gajim theme (delete all lines in your config starting with themes. to see it) and theme names are now translatable

refactor the code so that it's not dup (vcard.get_avatar_pixbuf)

muc_highlight_words config option is now semicolon separated.