Rarity

Rarity is a measure for items in which number they appear. Also the higher the rarity level, the harder it gets to grow the item or block. The rarity currently affects:
- Gem drop rate (from blocks, as well trees)
- Seed drop rate (from blocks, as well trees)
- The chance of dropping the same items again (only blocks and consumable items)

Also, the rarity of the item before being spliced and made could be known by adding the rarity of the two seeds used to splice the item.