8136930: Simplify use of module-system options by custom launchers
8160489: Multiple -Xpatch lines ignored by javac
8156998: javac should support new option -XinheritRuntimeEnvironment
Reviewed-by: jlahoda, ksrini

8152897: refactor ToolBox to allow reduced documented dependencies
Reviewed-by: vromero

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

8056989: Sjavac --server option should be optional
8147568: NullPointerException in option parsing
Summary: Made --server option optional (and background=true implied)
Reviewed-by: jlahoda, erikj

8144009: ToolBox should have a cleanDirectory method
Summary: Added cleanDirectory method to ToolBox.
Reviewed-by: jjg

8139961: Various sjavac tests result in error on Windows (JPRT)
Summary: Test now closes Stream properly.
Reviewed-by: jlahoda

8135131: Enable thin server mode in Sjavac
Summary: State tracknig and incremental compilation disabled unless --state-dir is provided.
Reviewed-by: jlahoda