SidebarList: super-fancy close handles; Triplet: super-fancy close handles; Util: download and light_download functions; Value: set css for unreferenced statements; Editor: huge performance improvements

Wikidata: resilient downloads; Open: fast searches; preserve selection order when opening; back button or Esc button to close dialog; Sidebarlist: close entities from handle preserving selection order; correctly handle modifier keys; Values: put in scrolled window when less more then 5 claims present; Value: correctly display qualifiers; Entity: fixed units display; EntityPopover: search is working well.

Selection mode: added search button; Sub headerbar: made entity search a togglebutton and properly connected to entity search entry

windows download build

Flatpak: added appstream.xml; Screenshots: added real screenshots and overview; README: updated screenshots; Editor: added stub entity search bar connected to key_press_event and added missing tooltips