8172255: JShell API: ExecutionControl/LoaderDelegate: Remove unused/unimplemented setClassPath
Reviewed-by: jlahoda

8158906: JShell: crashes with extremely long result value
Reviewed-by: jlahoda, shinyafox

8160127: JShell API: extract abstract JDI and abstract streaming implementations of ExecutionControl
8159935: JShell API: Reorganize execution support code into jdk.jshell.execution (previously sent for review, and combined here)
8160128: JShell API: extract abstract streaming remote agent
8159122: JShell API: Configurable invocation mechanism
Summary: ExecutionControl implementation support with simplified ExecutionControl interface
Reviewed-by: jlahoda