Bump version to 1.1.4
Remove some dead code
Use register class instead of register_module

Adress the F6 redo menu Blender crash issue by:
1) Moving the properties from the operator to a property group
of window manager type (bpy.types.WindowManager.ivy_gen_props)
2) Only the update is exposed in the operator undo (a boolprop)
3) Settings moved into the CURVE_PT_IvyGenPanel located under the
Tools Region > Create > Ivy Generator

Functionality should be the same as before:

Since the window manager props are not jumping back on operator redo
the operator just pulls them in execute which allows change in the Panel
while operator is still active

The default values are assigned by setting the operator defaultIvy to True