Fix importing of function's signature from IDA

[saruman9]

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cfce5fa fix problem of exporting thunked function:

ERROR (FunctionsXmlMgr) Failed to create function at 00004294: Unable to create function at 00004294

The commit may be regressive, but I used Ghidra with merged the PR for a month and there were no problems.

Sadly Ghidra don't support parsing of many calling convention (see TODO in the code). I don't change CParser, because it will be very massive for the PR.

Fixes #1492.

[saruman9]

Any review?

[saruman9]

Any updates?

[ghidra1]

Our PROGRAM.DTD needs a big update to catchup with our API and is rather constrained. If you will work with us we can probably adapt it better to our API. We have always worried about exceeding the capabilities of IDA for function related details. We could probably start a Discussion where we could propose PROGRAM.DTD changes if someone like yourself could adapt the IDA import/export plugins.

[saruman9]

Sounds great! Unfortunately, I no longer have a license for IDA to help you. If I have it, then I will continue working in this direction. BTW I think that a Discussion will be useful, because many people use the plugin to transfer information to/from IDA.

[ryanmkurtz]

Closing this due to it getting very out of date, and no one having IDA to properly test it.