feat(ElementInjector): implement ElementInjector

Initial implementation of ElementInjector.

Works:
1. The creation of proto element injector trees
2. Bindings
3. The instantiation of element injectors
4. The instantiation of directives
5. Visibility: Parent and Ancestor
6. Delegation to application injectors
7. Error handling

Missing features:
1. Handling components.
2. Setting "special" properties (e.g., Element, View).
3. Cycle detection
4. Distance
5. Text nodes
I don't mind dereferencing it. But I'm pretty sure it won't result in any performance gains in this particular case. We are not calling any functions, so the VM should know that the id property does not change.