#4 store and display external references

[Martin Baker]

This new feature is to store and display external
references.

This will allow the program to resolve all its
references such as includes and other files in the same
class. The program does not hold the full information
about external files but only down to the debth
required to match to the externals.
The other purpose of this feature is to provide
information required to translate library references
when converting from and to other languages.

It will hold the following information about the
external references:

* packages - may contain many packages, each under
its own package node.
* classes and interfaces - includes name of class
and the extends/implements information and meta information
* variables - name and type of variable but not
initialisation.
* methods and constructors - includes name, return
type, parameters and meta information but not method
body statements.
* annotations

Comments are not included except meta information and
formal (javadoc) type of comments.

The display will show this information under externals
tab as a tree similar to the parser tree tab.

[Martin Baker]

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Further information here:

http://www.euclideanspace.com/software/language/xes/project/external/