[Import]Fix FreeCAD#6461 MEASUREMENT/INSUNITS

Change macro path selection from File to Folder

Gui: ProDark Stylesheet QT Icon Fix

forum thread: https://forum.freecadweb.org/viewtopic.php?f=34&t=57427

Fem: [skip ci] set backend of matplotlib to Qt5Agg

Version 0.19

App/Gui: New restoreError Document status and Gui pop-up

========================================================

If the restore of Document.xml results in invalid Document.xml (because unhandled exceptions occurred), the
document status Document::restoreError is set. The GUI or Mod/Web if a link was clicked, show a pop-up indicating
this situation.

This commit also shows an appropriate pop-up for the partialRestore when opening from the menu, that before only
appeared when opening by clicking a link.

Fixed typo in last commit

pre-select name filter in import/export file dialog

AddonManager: Skip non-github addons

replace insecure use of eval() with proper use of units