[PATCH] [libclang/python] Add bindings for children of diagnostics

[Hanson via cfe-commits]

This exposes the Clang API bindings `clang_getChildDiagnostics` (which
returns a `CXDiagnosticSet`) and `clang_getNumDiagnosticsInSet` /
`clang_getDiagnosticInSet` (to traverse the `CXDiagnosticSet`), and adds a
helper `children` property in the Python `Diagnostic` wrapper.

Also, this adds the missing `OVERLOAD_CANDIDATE` (700) cursor type.
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