Not working for .kicad_sch files

[hildogjr]

Not working for the new .kicad_sch files (for NIgthlies v5.99 and next coming v6). This is cause for read_sch(foor) function.

Merge propose: https://github.com/essele/kicad_jlcpcba/pull/4 proposed make the plugin recognize Linux directory pattern.

Other propose: Use "lcsc#" field instead "lcsc" only for the internal part fields, this will make this plugin also integrated with https://github.com/xesscorp/KiCost/. Change the output files for projectname_jlcpcba_*.csv to not mix with others KiCad output.