[smuxi] (15 commits) ...Merge pull request #206 from carlosmn/show-image

[Mirco M. M. Bauer <mmmbauer src gnome org>]

Summary of changes:

  74261f6... [Frontend-GNOME] Show an image message part
  ec8568f... [Frontend-GNOME] Extract the icon download and caching logi
  7832bb6... [Common] Move IconCache here
  cdac332... [Frontend-GNOME] Check for the existence of the emoji file
  3c87bbe... [Engine] Match emoji and and replace them with an image par
  04bd8fd... lib/emoji.json: add the emoji defintions
  8a234a8... [Common] Create mapping for emoji from name to codepoint
  952b32b... [Common] Add an onError callback to IconCache
  40f7a5b... [Common] IconCache: add method to download a particular ima
  9348a7f... [Frontend-GNOME] Load emoji from the cache, or download fro
  3dda9ac... [Common] Prefix 'Begin' to IconCache's async functions
  1e7ccad... [Frontend-GNOME] Set the emoji size to the line height
  5c6e602... [Frontend-GNOME] Apply text size changes to emoji
  9908218... [Frontend-GNOME] Drop the emoji to the bottom of the line
  5a59a8b... Merge pull request #206 from carlosmn/show-image