* [Draft gui_stretch] Improve Stretch Rectangle Behaviour
Feature Improvement discussed at FreeCAD Forum :
- https://forum.freecad.org/viewtopic.php?t=92124#p792118 (Draft_Stretching the whole rectangle creates a new wire)
Currently, 3 cases in general, proposed PR improve Case 3 below :
1. The original object is a Rectangle, if after stretching it is no longer a rectangle, it makes a copy turning it into a Wire which reflect the result of stretching.
- Current behanviour is good for user, no change.
2. If after stretching it is still a rectangle, the code just resize the original.
- Current behanviour is good for user, no change.
3. Now, if the user 'stretch' the whole rectangle, the code creates a copy as DWire in the 'stretched location'.
** - Users find this not intuitive, better just move the whole rectangle.
With this PR the following 5 command modes are automatically stored in the preferences:
* "ContinueMode"
* "RelativeMode"
* "GlobalMode"
* "fillmode" (existing preference, removed from the Preferences Editor)
* "SubelementMode"
Additionally:
Three commands (Draft_Ellipse, Draft_Rectangle and Draft_Stretch) call `setRelative` after the 1st point has been specified and would permanently switch on relativeMode. After this PR this switch is temporary.
In Python 3 `super()` can be used without an argument
in order to get the parent class, `super()`.
In Python 2 the present class must be used as an argument,
`super(ThisClass, self)`.
This commit is done to support Python 2,
as without it all Gui Command tools will be broken
and will fail to launch, even if the unit tests pass.
Also, set the `__metaclass__` variable to `type`.
This is done to turn all classes into "new style" classes
in Python 2. This is required so `super()` works correctly
in this version of Pyton.
This commit can be reverted once Python 2 support
is completely dropped, and only Python 3 compatible code
is used.
