add support for the collection of PE header imports and exports

[djhaynes]

We should consider the collection of PE header imports and exports.

Imports:
*RVA (hexadecimal. example: 0040252C)
*Filename (string. example: MSVCR80.dll)

Exports:
*Name (string. the name of the exported function. Example: RegCreateKeyEx())
*Entrypoint (hexadecimal. example: 0051454F)
*Ordinal (integer. may not be completely necessary. Example: 8)

[djhaynes]

This tracker item needs more investigation and discussion with the community. As
a result, this tracker item is being deferred for the OVAL 5.10 release.

[djhaynes]

This is a duplicate of #11.