Release v2

Major rework of the debugger and further optimization changes.

Changelog:

• new methods optimizing expensive recalculations: Cache & OnChange
• better ui debugger with ability to force rerender and modyfing state of the components
• Load method that helps updating ui based on resources loaded asynchronously
• hidden OnRender event from IComponent as it is only intended for internal use
• added component for attaching ui toolkit stylesheet to ui: StyleSheetWrapper