Ben Clayton cc93ba9747 Add the ability to derive message types from one another.
`DAP_IMPLEMENT_STRUCT_TYPEINFO_EXT` and `DAP_STRUCT_TYPEINFO_EXT` are two new flavors of `DAP_IMPLEMENT_STRUCT_TYPEINFO` and `DAP_STRUCT_TYPEINFO` that allow you to derive message types.

This involved a bit of reworking on the serializer interfaces.

Added test.

Issue: #32
2020-06-02 17:18:32 +01:00
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