* Add new icon `MeshPart_CurveOnMesh`, which is the same as
the `Surface_CurveOnMesh` icon but in green color.
The surface icon is used in the Surface Workbench, while the MeshPart
version is currently not used.
* Make the tooltip of the command shorter; the longer instructions
are added in the `TaskCurveOnMesh` task panel.
In the Surface Workbench, the command is called `Surface_CurveOnMesh`
and the only thing it does is call the corresponding command
in the MeshPart Workbench, where it is defined
under the name `MeshPart_CurveOnMesh`.
Currently the MeshPart Workbench is not exposed on the graphical user
interface but it is loaded at startup, and its commands
are in fact used from the Mesh Workbench and, in this case,
the Surface Workbench.
Also improve the tooltip of the other commands in the Surface Workbench:
`Cut`, `Filling`, `GeomFillSurface`, `ExtendFace`, and `Sections`.
The `Cut` command does not do anything at this moment
so it is not visible in the interface.
Move the icon Mesh_Mesh_from_Shape.svg
from .../Mod/MeshPart/Gui/Resources/icons
to .....//Mod/Mesh/Gui/Resources/icons
edit both Mesh.qrc and MeshPart.qrc accordingly
remove referrence to the icon from the command in
the MeshPart Command.cpp file and add it to
the Mesh Command.cpp file
