- Implemented UIView (which wraps an svg)
- Implemented UIButtonVC (general user interface button)
- Implemented UILabelVC (general user interface label)
- Implemented UIPlayTimeVC (UI control to play with the time)
- added some functionalities to TimeModel
- made architectural extension to ViewController (add child controller, updateView which is called on the child controller when it is added to the hierarchy)
-changed ToolsContainerController hierarchy according to the new extensions
-restyled some parts of the UI