Added support for iterating over diagram elements from inja templates (fixes #54)

src/sequence_diagram/model/diagram.cc

@@ -45,6 +45,18 @@ std::string diagram::to_alias(const std::string &full_name) const
     return full_name;
 }
 
+inja::json diagram::context() const {
+    inja::json ctx;
+    ctx["name"] = name();
+    ctx["type"] = "sequence";
+
+    inja::json::array_t elements{};
+
+    ctx["elements"] = elements;
+
+    return ctx;
+}
+
 }
 
 namespace clanguml::common::model {