fix the clang CI build

Every module unit now includes the standard headers it uses. Declarations
reaching a unit only through an imported module's global module fragment
are reachable but not visible, so ADL misses the free operators older
libstdc++ declares beside a type - reproduced on ubuntu 24.04 (libstdc++
13), where gl/vao.cpp could not compare vector iterators.

Also drops a stale editor/editorSettings.hpp from the MSVC source list,
which broke the Windows configure step, silences the deliberate
include-in-purview warning in the glm wrapper, and removes GCC support:
clang or MSVC only.

simulation/simulationsounds.cpp

@@ -1,4 +1,6 @@
 module;
+#include <string>
+#include <unordered_map>
 
 module eu07.simulation.simulationsounds;
 /*

simulation/simulationstateserializer.cpp

@@ -1,4 +1,8 @@
 module;
+#include <fstream>
+#include <ostream>
+#include <unordered_map>
+#include <utility>
 #include <chrono>
 #include <functional>
 #include <vector>

simulation/simulationstateserializer.cppm

@@ -7,6 +7,8 @@ obtain one at
 http://mozilla.org/MPL/2.0/.
 */
 module;
+#include <ostream>
+#include <string>
 #include <functional>
 #include <unordered_map>
 #include <memory>

simulation/simulationtime.cpp

@@ -1,4 +1,5 @@
 module;
+#include <string>
 #include <cstring>
 #include <algorithm>
 #include "winheaders.h"