Add a library selector to the save dialog. Initialize it to the
footprint's library. This way a straigh-up save will do what's
expected.
However, the user can still select the active library (or any
other library) if they really did want to move the footprint.
Fixes: lp:1750918
* https://bugs.launchpad.net/kicad/+bug/1750918
Improve dialog layout and fix UI policy issues with all of the dialog
boxes in the common, 3D viewer, CvPcb, and Eeschema code paths.
Updated the use of component to symbol.
columns. DIALOG_SHIM would resize each separate usage to the same
size. DIALOG_SHIM now supports and alternate m_hash_key in lieu
of the class name, optionally.