FEM: remove working dir and ccx binary check from InitGui - they are duplicates of the methods in FemToolsCcx - FEM could be used without solving too - they only checked for ccx, but we have more solver already
FEM: remove working dir and ccx binary check from InitGui
- they are duplicates of the methods in FemToolsCcx
- FEM could be used without solving too
- they only checked for ccx, but we have more solver already

Fat-Zer/FreeCAD_sf_master,usakhelo/FreeCAD,bblacey/FreeCAD-MacOS-CI,usakhelo/FreeCAD,bblacey/FreeCAD-MacOS-CI,Fat-Zer/FreeCAD_sf_master,bblacey/FreeCAD-MacOS-CI,Fat-Zer/FreeCAD_sf_master,wood-galaxy/FreeCAD,usakhelo/FreeCAD,bblacey/FreeCAD-MacOS-CI,wood-galaxy/FreeCAD,bblacey/FreeCAD-MacOS-CI,Fat-Zer/FreeCAD_sf_master,wood-galaxy/FreeCAD,usakhelo/FreeCAD,wood-galaxy/FreeCAD,Fat-Zer/FreeCAD_sf_master,usakhelo/FreeCAD,wood-galaxy/FreeCAD,usakhelo/FreeCAD,bblacey/FreeCAD-MacOS-CI,wood-galaxy/FreeCAD,usakhelo/FreeCAD,bblacey/FreeCAD-MacOS-CI