Add -1 / --oneshot support, to run one command (one tweet or one /command) and then exit in GUI mode
Only pull configuration.json the instant we need it (i.e., when twipper detects we're typing a URL); and then only do so once an hour, at most. Also detect the rate limiting response and reschedule the next update for just after the rate limit resets.
Add /go command to load links in a tweet, based on link#, using x-www-browser
Fix whitespace errors