Ensure all the dependency injection methods are accurately represented

[philpax]

There are now three, if my understanding serves me correctly:

1. accepting the services as parameters in your constructor
2. accepting the services as fields of your primary Plugin class (it is automatically initialised)
3. initialising another class with pluginInterface.Create to populate its static fields

[philpax]

Creation and injection of your own services and classes:

var poop1 = di.Create<PoopyClass>(myServiceA, myServiceB);
var poop2 = di.Inject(poopInstance, myServiceA, myServiceB);