feat: PDB import via RawPDB, no msdia140.dll dependency

Replace DIA SDK COM-based PDB importer with RawPDB (MolecularMatters)
which reads PDB files directly via memory-mapped I/O. Adds File menu
"Import PDB..." dialog with type filtering, selection, and progress.

- Vendor raw_pdb into third_party/
- Two-phase API: enumeratePdbTypes() + importPdbSelected()
- Full recursive import of structs/unions/arrays/pointers/bitfields
- PDB import dialog with name filter, select-all, type count
- Benchmark: 1654 types from ntkrnlmp.pdb in 16ms
- Reorganize import/export files into src/imports/

third_party/raw_pdb/src/CMakeLists.txt

@@ -0,0 +1,112 @@
+set(SOURCES
+	Foundation/PDB_ArrayView.h
+	Foundation/PDB_Assert.h
+	Foundation/PDB_BitOperators.h
+	Foundation/PDB_BitUtil.h
+	Foundation/PDB_CRT.h
+	Foundation/PDB_Forward.h
+	Foundation/PDB_Log.h
+	Foundation/PDB_Macros.h
+	Foundation/PDB_Memory.h
+	Foundation/PDB_Move.h
+	Foundation/PDB_Platform.h
+	Foundation/PDB_PointerUtil.h
+	Foundation/PDB_TypeTraits.h
+	Foundation/PDB_Warnings.h
+	
+	PDB.cpp
+	PDB.h
+	PDB_CoalescedMSFStream.cpp
+	PDB_CoalescedMSFStream.h
+	PDB_DBIStream.cpp
+	PDB_DBIStream.h
+	PDB_DBITypes.cpp
+	PDB_DBITypes.h
+	PDB_DirectMSFStream.cpp
+	PDB_DirectMSFStream.h
+	PDB_ErrorCodes.h
+	PDB_GlobalSymbolStream.cpp
+	PDB_GlobalSymbolStream.h
+	PDB_ImageSectionStream.cpp
+	PDB_ImageSectionStream.h
+	PDB_InfoStream.cpp
+	PDB_InfoStream.h
+	PDB_IPIStream.cpp
+	PDB_IPIStream.h
+	PDB_IPITypes.h
+	PDB_ModuleInfoStream.cpp
+	PDB_ModuleInfoStream.h
+	PDB_ModuleLineStream.cpp
+	PDB_ModuleLineStream.h
+	PDB_ModuleSymbolStream.cpp
+	PDB_ModuleSymbolStream.h
+	PDB_NamesStream.cpp
+	PDB_NamesStream.h
+	PDB_PCH.cpp
+	PDB_PCH.h
+	PDB_PublicSymbolStream.cpp
+	PDB_PublicSymbolStream.h
+	PDB_RawFile.cpp
+	PDB_RawFile.h
+	PDB_SectionContributionStream.cpp
+	PDB_SectionContributionStream.h
+	PDB_SourceFileStream.cpp
+	PDB_SourceFileStream.h
+	PDB_TPIStream.cpp
+	PDB_TPIStream.h
+	PDB_TPITypes.h
+	PDB_Types.cpp
+	PDB_Types.h
+	PDB_Util.h
+)
+
+source_group(src FILES
+    ${SOURCES}
+)
+
+add_library(raw_pdb
+    ${SOURCES}
+)
+
+target_include_directories(raw_pdb
+  PUBLIC
+    .
+)
+
+target_precompile_headers(raw_pdb
+  PRIVATE
+    PDB_PCH.h
+)
+
+option(RAWPDB_BUILD_EXAMPLES "Build Examples" ON)
+
+if (RAWPDB_BUILD_EXAMPLES)
+	add_subdirectory(Examples)
+endif()
+
+if (UNIX)
+	include(GNUInstallDirs)
+
+	install(
+		TARGETS raw_pdb
+		LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}"
+	)
+
+	file(GLOB_RECURSE HEADER_FILES
+		"${CMAKE_CURRENT_SOURCE_DIR}/*.h"
+	)
+
+	file(GLOB_RECURSE HEADER_FILES_FOUNDATION
+		"${CMAKE_CURRENT_SOURCE_DIR}/Foundation/*.h"
+	)
+
+	install(
+		FILES ${HEADER_FILES}
+		DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/raw_pdb/"
+	)
+
+	install(
+		FILES ${HEADER_FILES_FOUNDATION}
+		DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/raw_pdb/Foundation"
+	)
+endif (UNIX)