* Draft: Remove main QGroupBox from Circular Array tool
* Draft: Remove main QGroupBox from Polar Array tool
* Draft: Remove main QGroupBox from Ortho Array tool
* Draft: Remove AxisMode QGroup from Ortho Array tool
* Draft: Remove main QGroup from ShapeString tool
* 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
It replaces the older `Draft_Array` command, and provides
a task panel to select the properties, similar to the
`Draft_PolarArray` and `Draft_CircularArray` commands.
It can also create `App::Links` directly from this task
panel, so it also replaces the `Draft_LinkArray`
introduced by the LinkMerge.
