FEM: solver z88, add icon and make use of it

src/Mod/Fem/Gui/Resources/Fem.qrc

@@ -74,6 +74,7 @@
         <file>icons/FEM_SolverElmer.svg</file>
         <file>icons/FEM_SolverRun.svg</file>
         <file>icons/FEM_SolverStandard.svg</file>
+        <file>icons/FEM_SolverZ88.ico</file>
 
         <!-- object icons without gui command -->
         <file>icons/fem-femmesh-from-shape.svg</file>

src/Mod/Fem/femcommands/commands.py

@@ -744,7 +744,7 @@ class _SolverZ88(CommandManager):
 
     def __init__(self):
         super(_SolverZ88, self).__init__()
-        self.pixmap = "FEM_SolverStandard"
+        self.pixmap = "FEM_SolverZ88.ico"
         self.menuetext = "Solver Z88"
         self.accel = "S, Z"
         self.tooltip = "Creates a FEM solver Z88"

src/Mod/Fem/femsolver/z88/solver.py

@@ -88,6 +88,8 @@ class Proxy(solverbase.Proxy):
 
 
 class ViewProxy(solverbase.ViewProxy):
-    pass
+
+    def getIcon(self):
+        return ":/icons/FEM_SolverZ88.ico"
 
 ##  @}