8173308: JAVAC_OPTIONS should be updated to align with JAVA_OPTIONS
Reviewed-by: jjg

8166472: javac/javadoc expands @files incorrectly
Reviewed-by: henryjen, ksrini

8145472: replace remaining java.io.File with java.nio.file.Path
Reviewed-by: vromero

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