Also don't load the footprints up front. The whole purpose of the
footprint-info stuff is to have enough info about the footprints to
filter them *without* loading. After that just load individual
footprints as we need them.
Fixes https://gitlab.com/kicad/code/kicad/issues/6177
This ensures the colors used by the status text pane in the preview
widget are the same as the canvas, so there is a seemless transition
between the two.
Additionally, remove the scrollbars from the symbol preview widget
in the place symbol dialog - they are pointless.
- Pull out compound widget bits into FOOTPRINT_PREVIEW_WIDGET
- Move all pcbnew-specific bits *inside* pcbnew; implementation should
be private for users
- Make a few class members and inner types private