guild templates

[webtax-gh]

introduces a dtemplate and dtemplate_map class and the following functions

/** Get a template */
void template_get(std::string code, command_completion_event_t callback);

/** Create a new guild based on a template. */
void guild_create_from_template(std::string code, std::string name, command_completion_event_t callback);

/** Get guild templates */
void guild_templates_get(snowflake guild_id, command_completion_event_t callback);

/** Creates a template for the guild */
void guild_template_create(snowflake guild_id, std::string name, std::string description, command_completion_event_t callback);

/** Syncs the template to the guild's current state. */
void guild_template_sync(snowflake guild_id, std::string code, command_completion_event_t callback);

/** Modifies the template's metadata. */
void guild_template_modify(snowflake guild_id, std::string code, std::string name, std::string description, command_completion_event_t callback);

/** Deletes the template */
void guild_template_delete(snowflake guild_id, std:: string code, command_completion_event_t callback);

everything should be done i just need to test everything