Use the HTML_MESSAGE_BOX window to present the warning messages rather
than wxMessageBox which would overflow the display when there were a lot
of graphic items that could not be parsed.
Fixes lp:1839565
https://bugs.launchpad.net/kicad/+bug/1839565
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.
To use multiple working threads. This entailed adding KiCad typedefs:
*) Add typedefs for MUTEX and MUTLOCK which mask the actual choices for the project.
*) Add FOOTPRINT_LIST::DisplayErrors( wxWindow* ) which is a single strategy for
showing aggregated load errors. Although what's there is only scaffolding
and needs a volunteer who knows HTML pretty well.
*) Ensure all callers of ReadFootprintFiles() use the new DisplayErrors() function.
*) Push utf8.cpp and utf8.h into common library for open use.
Simon Richter
Wayne Stambaugh
Jeff Young
Chris Pavlina
Dick Hollenbeck
jean-pierre charras