8133549: Generalize jshell's EditingHistory
Summary: Using a generic EditingHistory in jjs
Reviewed-by: sundar

8134562: jjs history object should have methods to save/load history to/from given file and also allow reexecution of commands by a call
Reviewed-by: hannesw, attila

8134279: jjs should support multiple line input to complete incomplete code
Reviewed-by: attila, hannesw

8133872: Expression completion should work on contexts where an expression is accepted
Reviewed-by: hannesw, mhaupt

8133777: Use file based persistence for history instead of preferences
Reviewed-by: attila, mhaupt