copy value before taking address, lock message create handler to make sure messages arrive in the order they're received, relay discord message updates, return after calling telegram command handler

reset telegram mentions on discord message, two-way reference of sent messages, change a default config, implement discord message relaying, thing

handle start command and return invite URL, move command handler to its own function, fix image relay, escape everyone mentions

relay reply, relay edit, properly skip backlog, fix resource leak, relay photos (for some reason it relays multiple with different sizes, still need a fix)