Migrate from QDomDocument to QXmlStreamReader

[ubruhin]

QDomDocument is deprecated in Qt6 and requires a separate Qt module (QtXml). Qt docs recommend to use QXmlStreamReader instead, which is even part of QtCore.

TODO: Do more testing.

[Copilot]

Pull request overview

Migrates the project’s XML parsing away from deprecated QDomDocument/QtXml toward a QXmlStreamReader-based parser in DomElement, reducing dependencies (QtCore-only) and aligning with Qt6 recommendations.

Changes:

• Replace QDomDocument parsing in board/library/schematic loaders with DomElement::parse(...).
• Rework DomElement internals to build the element tree using QXmlStreamReader.
• Remove the QtXml component from CMake configuration and linking.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
parseagle/common/domelement.h	Replaces QDom-based API with DomElement::parse(...) stream-based parsing entrypoints.
parseagle/common/domelement.cpp	Implements the QXmlStreamReader-driven element tree parsing logic and new parse overloads.
parseagle/board/board.cpp	Switches board loading to the new DomElement::parse(content) path.
parseagle/library.cpp	Switches library loading to the new DomElement::parse(content) path.
parseagle/schematic/schematic.cpp	Switches schematic loading to the new DomElement::parse(content) path.
CMakeLists.txt	Drops QtXml from find_package and linking; links only Qt::Core.

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