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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