Open plt files (re-add sK1 UniConvertor), continuation of LP#1658260

Migrated from: https://bugs.launchpad.net/inkscape/+bug/1658260
continuation from LP: "Inkscape 0.92 can't open or save .plt files" LP#1658260

Just got word from SK1 devs that an update is issued:

"@8thrule @raboof we have added optional parameter for svg processing: --svg_dpi Default value is 90, but you can use 96 to resolve issue.

uniconvertor file.svg file.plt --svg_dpi=96 Hope this fix the issue. You may test changes using uniconvertor night builds:"

https://github.com/sk1project/sk1-wx/issues/44#issuecomment-457963940

Edited Aug 21, 2020 by Nathan Lee

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