Fix parsing of IfcPropertyTableValue: handle parentheses in value lists

[giacomolamanna]

Summary

This pull request fixes a parsing issue in the IfcPropertyTableValue.parse method.

Problem

When .ifc files include value lists like (IFCLABEL('X')), the GeometryGym parser did not handle them correctly because the parentheses were not removed before calling SplitLineFields.

As a result, DefiningValues and DefinedValues were not being populated.

Solution

This fix adds a check that strips the outer parentheses from the string (if present) before parsing. This allows correct handling of value lists.

Impact

The change affects only IfcPropertyTableValue.parse() and is backward-compatible. All other classes are untouched.

Test Case

This issue was identified while parsing the official buildingSMART IDS test case:

📂 fail-any_matching_value_in_a_table_property_will_pass_3_3.ifc
📎 Test file link on GitHub

With this fix, DefiningValues and DefinedValues in the IfcPropertyTableValue are correctly populated.

[giacomolamanna]

Hi, just wondering if you had a chance to take a look at this PR. Let me know if there’s anything I should adjust or improve.
Thanks