Unpack includes, shares and source code for a recipe / package.

[vishen]

Some packages are archived along with source code or code for stdlib functionality etc. It might be useful to be able to have an "install" config variable which would be a directory for installed code to be saved at (this could also be overwritten by the package in the config?).

A good example is node / npm which comes with a node executable which is a single binary, and then npm which is a javascript script which relies on code from the packaged lib/, share/ and cinclude to be in a known location.

This would also be useful for protoc which includes some includes/ proto files for useful proto definitions.