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.

widgets/cameraview_extcam.cpp

@@ -1,4 +1,9 @@
 module;
+#include <atomic>
+#include <chrono>
+#include <condition_variable>
+#include <optional>
+#include <string>
 #include "glad/glad.h"
 #include "stb/stb_image.h"
 #include "utilities/Globals_macros.h"

widgets/cameraview_extcam.cppm

@@ -2,6 +2,7 @@
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 module;
+#include <string>
 #include <atomic>
 #include <condition_variable>
 #include <mutex>

widgets/map.cpp

@@ -1,4 +1,5 @@
 module;
+#include <iterator>
 #include "utilities/translation_macros.h"
 #include "glad/glad.h"
 #include <GLFW/glfw3.h>

widgets/map.cppm

@@ -1,4 +1,6 @@
 module;
+#include <string>
+#include <utility>
 #include <array>
 #include <memory>
 #include <vector>

widgets/map_objects.cpp

@@ -1,4 +1,8 @@
 module;
+#include <array>
+#include <map>
+#include <string>
+#include <vector>
 #include <memory>
 #include "vehicle/DynObj_macros.h"
 

widgets/perfgraphs.cpp

@@ -1,4 +1,6 @@
 module;
+#include <array>
+#include <vector>
 #include <string>
 #include "utilities/translation_macros.h"
 #include "imgui/imgui.h"

widgets/perfgraphs.cppm

@@ -1,4 +1,5 @@
 module;
+#include <array>
 #include <string>
 #include <vector>
 

widgets/trainingcard.cpp

@@ -1,4 +1,7 @@
 module;
+#include <atomic>
+#include <ios>
+#include <optional>
 #include "imgui/imgui.h"
 #include <cmath>
 #include <fstream>

widgets/trainingcard.cppm

@@ -1,4 +1,5 @@
 module;
+#include <string>
 #include <atomic>
 #include <optional>
 #include <thread>