Added 'to' sequence diagram generator for plantuml and json

src/config/config.h

@@ -543,6 +543,7 @@ struct sequence_diagram : public diagram {
 
     option<std::vector<source_location>> start_from{"start_from"};
     option<std::vector<std::vector<source_location>>> from_to{"from_to"};
+    option<std::vector<source_location>> to{"to"};
 };
 
 /**

src/config/schema.h

@@ -196,6 +196,7 @@ types:
         participants_order: !optional [string]
         start_from: !optional [source_location_t]
         from_to: !optional [[source_location_t]]
+        to: !optional [source_location_t]
     package_diagram_t:
         type: !variant [package]
         #

src/config/yaml_decoders.cc

@@ -575,6 +575,7 @@ template <> struct convert<sequence_diagram> {
 
         get_option(node, rhs.start_from);
         get_option(node, rhs.from_to);
+        get_option(node, rhs.to);
         get_option(node, rhs.combine_free_functions_into_file_participants);
         get_option(node, rhs.generate_return_types);
         get_option(node, rhs.generate_condition_statements);

src/config/yaml_emitters.cc

@@ -349,6 +349,7 @@ YAML::Emitter &operator<<(YAML::Emitter &out, const sequence_diagram &c)
     out << YAML::Key << "type" << YAML::Value << c.type();
     out << c.start_from;
     out << c.from_to;
+    out << c.to;
     out << dynamic_cast<const inheritable_diagram_options &>(c);
     out << YAML::EndMap;
     return out;