AndreMiras / pycaw / 20382538633

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:sparkles: Add robust PROPVARIANT handling and PolicyConfig fallback

Improve reliability across different Windows versions and comtypes
installations by adding fallback logic for PROPVARIANT union access
patterns and IPolicyConfigVista interface support.

- Handle multiple comtypes memory layouts for VT_LPWSTR in GetValue()
- Add FriendlyName fallback to DeviceDesc property
- Add IPolicyConfigVista interface for Windows Vista/7 compatibility
- Add SetDefaultDevice fallback from IPolicyConfig to IPolicyConfigVista

Based on patterns from Mr5niper's WindowsAudioControl-CLI-wGUI, closes TODO-108

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