Adds a rarity value to seeds.  CentComm gives points for rare seeds, and for high-potency samples.
Fixes the species property for grown items by removing it (it wasn't being set by slimes or spawn, and was pointless).

Removes some debug lines.
Puts the shuttle timer back to 1200.
Merge branch 'master' of https://github.com/tgstation/-tg-station into HydroCargoPoints
Switched to an associative list for the list of discovered plants.
Removed a grown-species lines I had commented out and forgotten to remove.
Updated a bunch of \blue and \red to span tags.
Moves the seed check into the original loop along with plasma since sorting the seed list wasn't worthwhile.
Eggyseeds set to 0 rarity because they're in "exotic seed" crates from CentComm.
Merge pull request #2389 from Rolan7/HydroCargoPoints

Hydro cargo points