Complete the migration to the new sbt-rc API, except with ignoring multi-project support.

* Bump to latest sbt-remote-control
* Alter our internal sbt actors to not "color" messages.
* Use RawStructure rather than Scala's JSON lib.
* Update javascript for new message format.

After this commit, the "Hello, Scala" and "Hello, Play"
templates are fully functional.

i#Fix console + play event hooks for new API.