* Make the grid display settings separate from the board object
* Ensure that the grid is initialized on creation in all the frames
Fixes: lp:1843169
* https://bugs.launchpad.net/kicad/+bug/1843169
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
This allows it to participate in Kiway things such as updating
language or common settings.
Fixes: lp:1779558
* https://bugs.launchpad.net/kicad/+bug/1779558
(cherry picked from commit b3f8478)