Replace --update-check option with --updated and --notifications options
--updated restricts downloader to operate only on games that have update flag set in account page
--notifications shows the number of new forum replies, updates games, unread chat messages and pending friend requests
--clear-update-flags clears update notification flags for all games
Remove aliases for --game option
"free" could no longer be used as originally intended and "all" was unnecessary because leaving regex empty has the same effect
Try to use Linux installers as replacement for Galaxy repository.
Linux installers use MojoSetup which means that the installers are Zip files that have bash script and installer binary prepended.
We can get zip file entries from zip central directory and then split the game installer to chunks based on those file entries.
Therefore we can download individual files from the installer.
