Implement selection for Tet4 elements
Fix gcc build error
Fix compiler warning
0001053: New Start Page tab every time the Start WB is selected
new Part Primitives icons, display tree icons Part Line and Circle

New icons for Parametric Part Primitives
Point, Line, Circle, Ellipse, Helix

Display the icon in tree via independent viewproviders for
Part Parametric Line and Circle

Change Part Box tree icon to display yellow Part Box icon from the tool bar
add ViewProviders & Tree icons for Part Point, Ellipse, & Helix

Add ViewProviders to select an icon for the part primitives
Point, Ellipse, Helix,
Also return Part Box tree icon to "Tree_Part.svg"
Minor mod to icons for Part Circle, Ellipse,Helix, Line

reduce size of Circle, Ellipse,Helix, Line, within the icons
To increase their spacings so when stacked they don't collide
Add Tree icons for 3d Part primitives

This commit is just the icons themselves, not
the code to display them yet.
Tree_Part_Box, Tree_Part_Cone, Tree_Part_Cylinder,
Tree_Part_Sphere, Tree_Part_Ellipsoid,
Tree_Part_Torus,
Change the tree icon displayed for Part_Box

Change the icon file name in the viewprovider for Part_Box
Add Part Box, Cylinder, Cone, Sphere, Ellipsoid, Torus
tree icons to the Part.qrc file
Add Parametric Part Plane Tree icon and reference in Part.qrc

Add Tree_Part_Plane_Parametric.svg and add its reference in
src/Mod/Part/Gui/Resources/Part.qrc
display Parametric Ellipsoid Tree icon

Add the line
sPixmap = "Tree_Part_Ellipsoid_Parametric.svg";
to the Ellipsoid viewprovider
show Part_Extrude icon in the tree

Added reference to existing Part_Extrude icon
to ViewProviderExtrusion.cpp
Enable Part_Mirror child item in tree

Part_Mirror now shows its child shape in the tree under
the newly created Mirror Feature. On deletion it's
child shape is set to show (if it had been hidden). Thus
making its behaviour and appearance consistant with other
Part tools, E.G. Part Fillet, Part Loft, etc.
Tree icons now display Part Plane, Torus, Sphere, Cylinder,Cone

Created ViewProviders for the above.
Fixed a minor typo in the Part Line ViewProvider