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
* if the current select plugin is the github plugin, one can select some of these libraries and add them to the table
* if the current select plugin is the kicad plugin, one can select some of these libraries and download them to make alocal copy.
They can added to the table after they are downloaded.
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.
jean-pierre charras
Jeff Young
Wayne Stambaugh
Chris Pavlina
Wayne Stambaugh
Dick Hollenbeck