Environment/queue support

Several things:

~~[ ] beat.cmdline#21 (closed): Support fetching env/queue info from beat.web~~
~~[ ] beat.web#495 (closed): expose env details (pkgs & versions) from env api~~
move the string inputs to selects (select a env/version/queue instead of manually entering the name)
per-block env/queue overrides
integrate with samuel's pkg changes

Edited May 03, 2018 by Jaden DIEFENBAUGH

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information