- show hint when trying to save an illegal contact (empty name or collision)
- contacts list (selection logic is a bit less straight forward than with messages because contacts are not a list but have strings as keys to prevent duplicate entries)
- contacts list: only show first line of notes
- add direct recipients (in TO) to contacts when sending (in gui.lua, as it's a comfort feature)
- set messages immediately when clicking read/unread, not *after* redrawing the inbox
- set messages only when something changed to reduce disk writes
- move marking mails read to the show message formspec (exept the direct button)
- adjust "No Mail" label
- restructured storage.lua so reading/writing json is not duplicated
- when a player joins and has no contacts file yet, automatically add all players he wrote to
- messages are now actually sent (bug in parse player list)
- no more crashes on sending mail (forgot to make variables local)
- actually handle CC and BCC fields instead of leaving them empty, duh
- make new functions be under the mail namespace
- add util functions to ensure the new format, parse and player list as well as checking whether a player is in that list or not
- rearrange some GUI elements (tighter spacing, grouping, increase window height to be consistent)
- convert mails to new format only as needed (old mails stay intact in case someone reverts to old version)
- mails are shaded differently in inbox, depending on whether the player is in the TO field
- FROM, TO and CC fields are all displayed when reading a mail
- add "Reply All" button (TO includes all original recipients plus the sender, but excluding the player himself, while adopting the CC field. To contrast: "Reply" just sets the original sender as TO and leaves the rest empty)
- move reply, replyall and forward to their own functions in GUI (was duplicated for inbox and show mail)
- don't needlessly set messages table when we do nothing but go back
