Tkviews

- upgraded pyviews to 4.0.0
- added docs

- added Radiobutton two ways binding
- added Lisbox pipeline
- added PanedWindow pipeline
- added Scale two ways binding
- added Spinbox two ways binding

- setup refactoring
- fixed ttk rendering
- styles refactoring
- removed TtkNode
- added presenter
- added pipeline name to display in error info
- added getting current rendering context
- fixed canvas rendering pipeline

- updated pyviews to 3.0.0
- CanvasNode is renamed to CanvasItem
- added geometry setter instead of property
- removed style property and added apply_styles setter instead

- updated pyviews to 2.3.0

- updated pyviews to 2.2.0