Support MS Word "Field Functions" in DOCX Emitter

[hvbtup]

In my fork at https://github.com/triestram-partner/birt (see branch tup-4.20), there is an older customized emitter for MS Word (DOCX) output (see https://github.com/triestram-partner/birt/tree/tup-4.20/engine/com.tp.birt.report.engine.emitter.docx and https://github.com/triestram-partner/birt/tree/tup-4.20/engine/com.tp.birt.report.engine.emitter.wpml).

With this emitter, it is possible to output emit MS Word "field functions" for label items.
The label needs a user property (of type string) called "WordEmitter.FieldFunction". This contains the name of the field function, e.g. PAGE or NUMPAGES, but IIRC also field functions with arguments like DOCPROPERTY or whatever.

I wonder if it makes sense to add this feature to the "official" emitters here, or if there is already similar functionality (except for the page numbering) which I don't know of.

My motive is not totally altruistic, in the long run I want to get rid of this custom emitter, as it is hard to keep it up to date.

[speckyspooky]

I like the idea to add this to the BIRT-standard emitter to support the option.
I would also support the option.