GenericPlugin: Add global() function

Author: taminob

include/ppplugin/plugin.h

@@ -57,6 +57,17 @@ class GenericPlugin {
     template <typename ReturnValue, typename... Args>
     [[nodiscard]] CallResult<ReturnValue> call(const std::string& function_name, Args&&... args);
 
+    template <typename VariableType>
+    CallResult<VariableType> global(const std::string& variable_name)
+    {
+        return plugin_.global(variable_name);
+    }
+    template <typename VariableType>
+    void global(const std::string& variable_name, VariableType&& new_value)
+    {
+        plugin_.global(variable_name, std::forward<VariableType>(new_value));
+    }
+
     template <typename P>
     std::optional<std::reference_wrapper<P>> plugin();