improve druntime.zip rule

- add doc and import as dependency
- pass -T to info-zip as to check the content
- fix oversight when .di files were moved to src
Make type demangling available in the public API.
Merge pull request #434 from s-ludwig/master

Break out a demangleType function to handle DMD's new JSON output
Merge pull request #413 from dawgfoto/fixWinMaks

improve druntime.zip rule
Fixup 3851 - Buffer length needs to fit size_t.max
Merge pull request #435 from AndrejMitrovic/Fixup3851

Fixup 3851 - Buffer length needs to fit size_t.max