Many Mesh Design Workbench commands do not have icons. The Mesh FillupHoles command is one of these without a SVG icon for the FreeCAD UI.
This commit adds a SVG file with an icon design for this command. Also, it makes the necessary changes on Command.cpp and Mesh.qrc files.
The new SVG icon follows the FreeCAD Artwork Guidelines:
https://www.freecadweb.org/wiki/Artwork_Guidelines
The icon design keep the style of the existing icons in the Mesh Workbench:
https://wiki.freecadweb.org/Mesh_Workbench
The discussion with the project for a set of SVG icons for the Mesh Design Workbench can be found in the UX/UI Design FreeCAD Forum:
https://forum.freecadweb.org/viewtopic.php?f=34&t=47494
An empty block after a conditional can be a sign of an omission and can decrease maintainability of the code.
Such blocks should contain an explanatory comment to aid future maintainers.