Fix BView detach callback dispatch - #18
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Dispatch DetachedFromWindow and AllDetached to their matching Python overrides instead of AllAttached. Add a regression test that exercises both C++ trampoline paths and verifies the callbacks received by a Python BView subclass.
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Problem
The BView trampolines for DetachedFromWindow() and AllDetached() both dispatch to the Python AllAttached() override.
Python subclasses therefore receive the wrong lifecycle callback when a view is detached.
Fix
Dispatch each trampoline to its matching Python override.
Validation
Verified that the bound base methods now invoke DetachedFromWindow() followed by AllDetached().