Also rewrites the PCBNew Find dialog to make use of the above, including:
1) searching in user-defined footprint fields
2) searching in pcb text
3) a history list in the search popup
4) case sensitive searching
5) word sensitive searching
6) the ability to turn wildcard searching on/off
7) better placement of the result when the dialog obscures part of the
window
Fixes: lp:1838006
* https://bugs.launchpad.net/kicad/+bug/1838006
3904d7ccfc