8178509: MODULE_SOURCE_PATH: Implement missing methods
8178493: StandardJavaFileManager: Clarify/document the use of IllegalStateException
Reviewed-by: jlahoda

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

8155774: move code from ModuleTestBase to toolbox
Reviewed-by: ksrini, jlahoda

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