8180727: Use jdk.editpad to replace jdk.nashorn.tools.jjs.EditPad duplicated class
Summary: Added support for using BuildInEditorProvider service implemenation provided by jdk.editpad module
Reviewed-by: hannesw, jlaskey
Contributed-by: srinivas.dama@oracle.com

8134397: Features that require AWT, swing should handle headless mode properly
Reviewed-by: hannesw, attila

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

8054834: Modular Source Code
Reviewed-by: alanb, chegar, ihse, mduigou
Contributed-by: alan.bateman@oracle.com, alex.buckley@oracle.com, chris.hegarty@oracle.com, erik.joelsson@oracle.com, jonathan.gibbons@oracle.com, karen.kinnear@oracle.com, magnus.ihse.bursie@oracle.com, mandy.chung@oracle.com, mark.reinhold@oracle.com, paul.sandoz@oracle.com