New features:

 * pan-down-symbolic and pan-end-sybolic for expander
 * Fix room notifications show with zero
 * Sidebar color using the gtk theme sidebar class
 * Add 128 and 256 icon sizes, tweak 512, add icon SVG source
 * Highlight notifications in blue in room sidebar
 * Bold for rooms with new messages
 * New room and left room events management
 * Load more messages recursive to avoid zero messages
 * Long polling instead of sync loop
 * Show invitation rooms in sidebar, Accept and Reject working