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/Examples/ExampleTimedScope.cpp

@@ -0,0 +1,54 @@
+// Copyright 2011-2022, Molecular Matters GmbH <office@molecular-matters.com>
+// See LICENSE.txt for licensing details (2-clause BSD License: https://opensource.org/licenses/BSD-2-Clause)
+
+#include "Examples_PCH.h"
+#include "ExampleTimedScope.h"
+
+namespace
+{
+	static unsigned int g_indent = 0u;
+
+	static void PrintIndent(void)
+	{
+		printf("%.*s", g_indent * 2u, "| | | | | | | | ");
+	}
+}
+
+
+TimedScope::TimedScope(const char* message)
+	: m_begin(std::chrono::high_resolution_clock::now())
+{
+	PrintIndent();
+	++g_indent;
+
+	printf("%s\n", message);
+}
+
+
+void TimedScope::Done(void) const
+{
+	--g_indent;
+	PrintIndent();
+
+	const double milliSeconds = ReadMilliseconds();
+	printf("---> done in %.3fms\n", milliSeconds);
+}
+
+
+void TimedScope::Done(size_t count) const
+{
+	--g_indent;
+	PrintIndent();
+
+	const double milliSeconds = ReadMilliseconds();
+	printf("---> done in %.3fms (%zu elements)\n", milliSeconds, count);
+}
+
+
+double TimedScope::ReadMilliseconds(void) const
+{
+	const std::chrono::high_resolution_clock::time_point now = std::chrono::high_resolution_clock::now();
+	const std::chrono::duration<double> seconds = now - m_begin;
+	
+	return seconds.count() * 1000.0;
+}