Provide specific objects on individual invocation about servicecontainer

[g105b]

It would be useful if the extraArgs overwrote the Injector when looking for a matching class instance. If there was already a XYZ class in the ServiceContainer, providing a new instance of XYZ to extraArgs would prefer to use this one.

This means we could provide one of two things:

1. provide a default instance of the ComponentBinder so when there's no specific instance provided, an exception is thrown saying something like "A ComponentBinder can only be used within a Component element's go/do functions".
2. Rename the DocumentBinder completely to just be a Binder... then the Binder itself can be overridden when in the context of a Component.

[g105b]

I like how just using a Binder everywhere enforces encapsulation, but maybe some components should be able to bind data outside of their own component element? Maybe? Maybe not... maybe they should just have access to the HTMLDocument if they need to be heavy handed with their encapsulation... (?)

[g105b]

More details on the above at PhpGt/DomTemplate#470