8142968: Module System implementation
Summary: Initial integration of JEP 200, JEP 260, JEP 261, and JEP 282
Reviewed-by: jjg, jlahoda, vromero, mcimadamore, bpatel, ksrini, darcy, anazarov, dfuchs
Contributed-by: alan.bateman@oracle.com, alex.buckley@oracle.com, jonathan.gibbons@oracle.com, karen.kinnear@oracle.com, mandy.chung@oracle.com, mark.reinhold@oracle.com, jan.lahoda@oracle.com, vicente.romero@oracle.com, andreas.lundblad@oracle.com, andrey.x.nazarov@oracle.com, chris.hegarty@oracle.com, erik.joelsson@oracle.com, kumar.x.srinivasan@oracle.com, sundararajan.athijegannathan@oracle.com

8059976: Convert JavacFileManager to use java.nio.file internally
Reviewed-by: jlahoda

8076543: Add @modules as needed to the langtools tests
Reviewed-by: jjg, shurailine

8061876: replace java.io.File with java.nio.file.Path (again)
Reviewed-by: ksrini, jlahoda

8062514: Update ToolTester tests to close file manager
Reviewed-by: darcy

8061723: 8060056 breaks tests on Windows
Reviewed-by: darcy

8060056: replace java.io.File with java.nio.file.Path
Reviewed-by: ksrini, jlahoda

8014363: javac test class ToolTester handles classpath incorrectly
Reviewed-by: ksrini

6943119: Rebrand source copyright notices
Reviewed-by: darcy

6838467: JSR199 FileObjects don't obey general contract of equals.
Reviewed-by: darcy

Initial load