compression.snappy: Add support for snappy compression by Google. Could possibly be optimized?
tools.gc-decode: Just make sure that the gc-decode tests work. Any answer
is ok.
io.launcher.windows.test/env.factor: Fix script for new . behavior.
imap: fix parse-store-mail parsing because it breaks on gmail

gmail responses include lines with the order of UID and FLAGS reversed
to indicate the previous flags for a mail. Just ignore those lines
because they aren't useful and non-standard.