BEI input replication had some weird tricks to make up for the lack of client-to-server replication.
There was a 'NetworkActionOf', a bunch of weird observers, etc.

This PR greatly simplifies the flow of setting up BEI input replication:

• you need to spawn the Context and Action entities on the server, and replicate them to the client
• on the client, you need to add the Bindings that you need on the replicated Action entity

In the future it will be possible to directly spawn Action entities on the client directly when replicon supports client to server replication.