add support for other filetypes for CAPE sandbox analysis

[williballenthin]

capa/capa/features/extractors/cape/extractor.py

Line 136 in 151d30b

if "PE" not in cr.target.file.type:

We have access to a bunch of non-PE results internally, so at least we can develop and test locally. Ideally we find some public non-PE CAPE results that we can add to our capa-testfiles repository to prove the changes work (fyi @doomedraven)