Add missing <cstdint> includes for GCC 13

Sprinkle includes of the <cstdint> header as needed to make the
build succeed with GCC 13, this fixes both with SDL and Qt builds.

Activity/Observer.hpp

@@ -9,6 +9,7 @@
 #ifndef ActivityObserver_h
 #define ActivityObserver_h
 
+#include <cstdint>
 #include <string>
 
 namespace Activity {

Analyser/Static/Commodore/File.hpp

@@ -9,6 +9,7 @@
 #ifndef File_hpp
 #define File_hpp
 
+#include <cstdint>
 #include <string>
 #include <vector>
 

Machines/Utility/ROMCatalogue.hpp

@@ -10,6 +10,7 @@
 #define ROMCatalogue_hpp
 
 #include <algorithm>
+#include <cstdint>
 #include <functional>
 #include <map>
 #include <optional>

Machines/Utility/StringSerialiser.hpp

@@ -9,6 +9,7 @@
 #ifndef StringSerialiser_hpp
 #define StringSerialiser_hpp
 
+#include <cstdint>
 #include <string>
 
 namespace Utility {

Reflection/Struct.hpp

@@ -13,6 +13,7 @@
 #include <cstdarg>
 #include <cstring>
 #include <cstddef>
+#include <cstdint>
 #include <string>
 #include <typeindex>
 #include <typeinfo>

Storage/Data/Commodore.hpp

@@ -9,6 +9,7 @@
 #ifndef Storage_Data_Commodore_hpp
 #define Storage_Data_Commodore_hpp
 
+#include <cstdint>
 #include <string>
 
 namespace Storage::Data::Commodore {