Externals / VideoCommon: update imgui to 1.91.7 and implot to v0.16; imgui changed types for ImTextureId, which was addressed by using an implicit cast

Externals/imgui/misc/cpp/imgui_stdlib.cpp

@@ -8,8 +8,15 @@
 //   https://github.com/ocornut/imgui/wiki/Useful-Extensions#cness
 
 #include "imgui.h"
+#ifndef IMGUI_DISABLE
 #include "imgui_stdlib.h"
 
+// Clang warnings with -Weverything
+#if defined(__clang__)
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wsign-conversion"    // warning: implicit conversion changes signedness
+#endif
+
 struct InputTextCallback_UserData
 {
     std::string*            Str;
@@ -73,3 +80,9 @@ bool ImGui::InputTextWithHint(const char* label, const char* hint, std::string*
     cb_user_data.ChainCallbackUserData = user_data;
     return InputTextWithHint(label, hint, (char*)str->c_str(), str->capacity() + 1, flags, InputTextCallback, &cb_user_data);
 }
+
+#if defined(__clang__)
+#pragma clang diagnostic pop
+#endif
+
+#endif // #ifndef IMGUI_DISABLE