Added nlohmann json to imhex directly

Once again Ubuntu is fucking outdated by over a year for literally no reason. Fuck this

plugins/libimhex/include/helpers/content_registry.hpp

@@ -35,6 +35,8 @@ namespace hex {
         };
 
         struct Events {
+            Events() = delete;
+
             static auto get(std::string_view name);
         };
     };