Improve word processor test coverage

LibreOffice Writer's internal layout engine is extremely intricate and historically dense. This means that attempting to modernize and refactor it is extremely difficult without comprehensive automated tests that account for every possible case. This is precisely why this project is shifting away from conventional bug hunting and instead focusing on an analytical and metric-driven Quality Assurance approach. By utilizing gcov and lcov, it is possible to automatically determine which C++ execution branches in the core layout module (sw/source/core/layout/) are not yet tested. By reverse-engineering test documents that specifically invoke these branches, it is then possible to create comprehensive CppUnit tests that utilize parseLayoutDump() and XPath queries to mathematically validate and "lock in" the correct internal XML layout tree representation. The final deliverables will be continuous lcov coverage reports that demonstrate quantifiable metrics, custom-engineered test documents (.odt/.docx), and dozens of high-quality C++ layout tests that will be merged into sw/qa/extras/layout/. This project will create a comprehensive safety net that is significantly cheaper, easier, and safer for all core developers.