Extend parameter lookup helpers (query.py)

[Wurschdhaud]

Description

get_param previously only accepted a string name, routing everything through LookupParameter — which the Revit docs flag as ambiguous and non-portable. This PR broadens the API and consolidates the scattered safe_get_parameter helper into it.

What changed

• get_param now dispatches on identifier type: str (original behaviour), DB.BuiltInParameter, System.Guid, and DB.ElementId
• DB.ElementId resolution prefers GUID lookup, falls back to Definition, matching what safe_get_parameter did
• safe_get_parameter can be removed — all call sites migrate to get_param(elem, param_id) with no other changes

Backwards compatibility

Fully backwards compatible. get_param(element, "some name") behaves identically to before.

Why LookupParameter on strings is kept but not extended

It remains the right tool when you're confident a name is unique. get_params is the documented safer path when that assumption doesn't hold.

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Checklist

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• Code follows the PEP 8 style guide.
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• Changes are tested and verified to work as expected.

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