#690 Add method 'importedLibraries' to .Package and .RexxInfo

[Rony G. Flatscher]

In order to learn about the imported (native) libraries a method 'importedLibraries' should get defined for the Package and the RexxInfo class, which returns an array of (native) library objects, where such a returned library object has at least the following methods:

name ... full name of the native library
routines ... StringTable of routine objects or array of native routine names
methods ... StringTable of method objects or array of native method names