Added MenuBar using ActionBar and ContextualActionView for Edit Menu
Added actioncheckbutton.py and editcontview.py
Moved actioncheckbutton.py and editcontview.py to desginer/uix
Added KV Lang Area
Added Accordion to Toolbox and PlaygroundElement will be created at the mouse pointer
PropertyView, accepts only Numbers or Decimal or None for NumericProperty. Also,None is an accepted value for Properties with allownone=True
Added Tree in tree.py. Information is added to Tree, whenever a widget is added
Added class KVLangArea
Added events related to different ActionItemButtons in EditContView
Added events on_show_edit to KVLangArea and Playground. EditContView is shown when KVLangArea and Playground are clicked.
Corrected EditContView, clicking on EditContView will not call ActionBar's on_previous
Implemented EditContView->Delete for Playground
Refresh WidgetTree only when required, adding, focussing or deleting a widget instead of Clock.schedule_once
Supports deleting root widget.
Implemented EditContView->Cut, Copy and Paste for Playground
Implemented EditContView->Undo and Redo
Improved EditContView->Cut and Delete operations
Improved EditContView->Undo and Redo
Implemented View Menu and its ActionItems
ActionBar's height is 55sp