Removal of GeoAPI Proxy/Interface

[james-rae]

The proxy/interface on geoApi was made to give Angular an object to bind to, and then behind the interface we could swap data sources as layers loaded/failed/etc.
Given VueX can hotswap actual objects, a discussion was had and agreed upon that at this point it does not make sense to port over the interface.

Efforts will be made to utilize typescript to make the geoApi layer objects more uniform across layer types.

[james-rae]

This is mostly now irrelevant after GeoAPI got removed along with DOJO.

There might be a need for proxy/interface, but those cases are already covered in more detail in discussions #327 , #328