Add module exports

Starting from Java 9, when developing for the module system, you may not be able to access some internal classes in the JDK. If you're getting compilation errors due to encapsulation, you can use the AddExports parameter to force exporting of packages.

The AddExports parameter corresponds to the --add-exports command line parameter for javac.

saker.java.compile(
	SourceDirectories: src,
	AddExports: {
		Module: jdk.compiler,
		Package:[
			com.sun.tools.javac.jvm,
			com.sun.tools.javac.main
		],
		Target: example.module
	},
)

In the above example we've added the exports from the jdk.compiler module of the com.sun.tools.javac.jvm and com.sun.tools.javac.main packages to the example.Module module.

The Target property can also accept multiple module names. If the Target property is omitted, the packages will be exported for all unnamed modules.

The parameter also accepts simple string based input in the format of module/package=other-module(,other-module)*. If =other-module... is not provided, the package is exported to all unnamed modules:

saker.java.compile(
	SourceDirectories: src,
	AddExports: [
		jdk.compiler/com.sun.tools.javac.jvm=example.module,
		jdk.compiler/com.sun.tools.javac.main=example.module,
	],
)

This definition corresponds to the command line syntax of --add-exports.