cxx-qt-build: return an Interface from CxxQtBuilder #1287
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This still needs more refactoring later but is a first step.
This allows export() to have no args meaning we can return an Interface from the compile command next.
We however have two changes compared to CXX: 1. We allow you to change the root of the automatic include directory. 2. We allow you to include additional directories. Both of these changes are there to accomodate crates like cxx-qt-lib, that want to use e.g. `<cxx-qt-lib/qstring.h>` instead of `<cxx-qt-lib/include/qstring.h>`. Also cxx-qt-lib generates a definitions header which we need to include.
This is no longer needed. Also clean up some documentation on the API.
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Another take on #1285.
The main difference is in how include paths are handled for the CXX-style automatic include of the header directory.
In this PR, the root of the automatic inclue can be configured.
This leads to less changes for downstream crates.
It also allows us to move to an include system of "cxx-qt-lib/core/qstring.h" while keeping backwards-compatibility with forwarding-headers