Dependency injection: better support for non-UIComponent types

[jonisavo]

At the moment, dependency injection is designed for UIComponents. It can be used with other types, but it is very tedious. The following should be as easy as possible to implement:

// interfaces are omitted for brevity

public class MySecondDependency { /* code */ }

[Dependency(typeof(IMySecondDependency), provide: typeof(MySecondDependency))]
public class MyFirstDependency { /* code */ }

[Dependency(typeof(IMyFirstDependency), provide: typeof(MyFirstDependency))]
public class MyComponent : UIComponent { /* code */ }

One possible approach would be to introduce a new class that could be inherited from. It would contain the minimum code needed to get dependency injection working.

Furthermore, TestBed should be modified to work with all dependency consumers.

• Don't require Logger with dependency injection
• Create subclass for DI consumers
• Look into DI without interfaces
• Rework TestBed to accept non-UIComponent types
• Update documentation