Reverting pubspec
Revert "Testing simplified again since isolate communication stopped working.  Moved timer code into sendPort assignment so it can't possibly get called before sendport exists."

This reverts commit fa24933309ce4e5cafae0122fad05e2ae711095a.
Handling class instantiation and repeater with common services class and service handler
Fully working with communication and unified ServiceHandler & cleaned up.
Cleaned up and documented.