Systems now place all of their component factories into a `Components`
member. This improves code readability and makes it clear when we are
dealing specifically with ecs components.
The concrete ComponentFactory instances now have `Add` and `Get`
methods (as opposed to `AddAlpha` or `GetAlpha`). This enforces naming
of component factories as to avoid collisions when embedded in a struct
with other components.
Also, the ComponentFactory interface is embedded directly into the
concrete component factory without a name.
* added command line arg for launching ecs impl
* removed render system tests, was causing gl context issues in tests
* fixed all lint errors in d2systems