* Refactor AsyncUtil to just use an execution context rather than an actor system
* Create testkit-core, start moving data structures over to testkit-core
* WIP, getting rid of the hard dependency on BitcoinSAsyncTest and akka
* Rework test traits to not be dependnent on akka, move BaseAsyncTest into testkitCore, add a test trait that just uses the default scala executionContext
* Get everything compiling
* Move logback-test.xml to testkit-core so it applies to coreTest,cryptoTest as well
* Cleanup rebase issues
* Fix Deps.scala
* Address ben's code review
* Segregate jvm settings and compiler settings
* Filter out -Xfatal-warning for scalajs for now since there is a ton of errors
* Move maintainer settings into CommonSettings.settings
