Issue #2822444 by slashrsm, Berdir: Provide width and height to image…

… templates.

Issue #2767185 by Berdir, dmsmidt, tlyngej: Deprecate file/image fiel…

…d widgets which were moved to the Entity browser.

Issue #2712863 by Denchev, slashrsm: Fix PluginNotFoundException for …

…entity:file:undefined if installing when there are already images/files.