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

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

8031744: Annotations on many Language Model elements are not returned
Reviewed-by: jfranck, mcimadamore, emc, jlahoda, jjg
Contributed-by: joel.franck@oracle.com, maurizio.cimadamore@oracle.com

8056021: checkin for JDK-8027262 breaks Checker Framework
Reviewed-by: jjg, mcimadamore

8042358: some tests have placeholder bugid 1234567
Reviewed-by: mduigou

8026564: import changes from type-annotations forest
Reviewed-by: jjg
Contributed-by: wdietl@gmail.com, steve.sides@oracle.com

8013852: update reference impl for type-annotations
Reviewed-by: jjg
Contributed-by: wdietl@gmail.com, steve.sides@oracle.com, joel.franck@oracle.com, alex.buckley@oracle.com