This was always possible from modal browsers and from the footprint
editor, but it's now also possible from non-modal browsers and the
symbol editor.
Fixes: lp:920380
* https://bugs.launchpad.net/kicad/+bug/920380
Add Display Settings to Footprint Browser.
Make each of them OpenGL on OSX and Cairo on other platforms.
Allow auto-zoom to be turned off and save last zoom setting.
Make ordering of tools in htoolbar consistent.
Standardize grid and zoom drop-downs.
Fixes: lp:1791667
* https://bugs.launchpad.net/kicad/+bug/1791667