Draft: Introduce 1-axis mode for ortho array (#21602)

* Draft: Introduce 1-axis mode for ortho array

As the title says - the 1 axis mode allows to switch between all of the
axises mode and allows to modify only 1 axis at the time that user can
select with the checkbox.

* Draft: Rename to Linear Mode and remove redundant comments

* Draft: Display only one interval for the selected axis

* Draft: Cache selected variables in user.cfg - axis mode, intervals, etc...

* Draft: Make sure the checkboxes in OrthoArray are exclusively selected

* Draft: Apply review comments

Changed a couple of things according to review:
* linear mode is now being used as default during first startup (it
  wasn't before)
* applied Roy's comments about coding style, etc.
* grouped everything into separate QGroupBox which is dedicated for
  Linear Mode and has it's own labels, although spinboxes are shared so
  during mode switch we reparent them now
* removed Orthogonal Array's icon
* in the QGroup applied naming suggested in the review, X Intervals ->
  interval, etc.
* changed to radio buttons since we want exclusivity in selection

src/Mod/Draft/draftutils/params.py

@@ -506,6 +506,18 @@ def _get_param_dictionary():
         "Wall":                        ("bool",      False),
     }
 
+    start_val = App.Units.Quantity(100.0, App.Units.Length).Value
+    param_dict["Mod/Draft/OrthoArrayLinearMode"] = {
+        "LinearModeOn": ("bool", True),
+        "AxisSelected": ("string", "X"),
+        "XInterval": ("float", start_val),
+        "YInterval": ("float", start_val),
+        "ZInterval": ("float", start_val),
+        "XNumOfElements": ("int", 2),
+        "YNumOfElements": ("int", 2),
+        "ZNumOfElements": ("int", 2)
+    }
+
     # Arch parameters that are not in the preferences:
     param_dict["Mod/Arch"] = {
         "applyConstructionStyle":      ("bool",      True),