SWIG Support

[h33p]

cglue-bindgen's C++ headers already "almost" work with SWIG for bindings generation. However, it would be nice to have a "just works (tm)" out-of-the-box experience.

Several things need to be done:

1. Disable heavily templated helper functions, as they are only useful for C++ and break SWIG.
2. Add SWIG binding language selection in config (an array most likely).
3. Generate SWIG module files.
4. Expand templates for default container/context type aliases. Template expansion needs to be done recursively for other typedefs, because SWIG doesn't handle multiple nesting levels properly.
5. Provide helpers/conversions on SWIG side for various type (CSlice/CIterator/Callback/etc.)
6. Extend examples with other languages.