v0.7.0: Multiplayer!

We're adding Arena, a new mode where you can play seeded runs one time against other players. These will have their own dedicated leaderboards to compete directly. Also, some weaker crops have been buffed a bit.

• Arena Mode!
• New Crop: Avocado!
• Spinach no longer needs to be away from other Spinach to score points.
• Beans now turns into fertile soil all at once after filling the entire column.
• Onion is now 1x1 and gains a new ability: On Spawn: Create an Onion in an adjacent empty square if next to no other Onion.
• Eggplant is now 1x1 and requires only 3 crops in a group to score 6 points for that group, instead of 4 in a group.
• Potato now gains 1 point per surrounding empty square, instead of per adjacent empty square.
• Rosemary now discounts only the most expensive Frozen crop instead of all Frozen crops, but by 2 coins up from 1 coin.
• New Start Levels! 12 new levels based on the most recent new crops and some level suggestions by BenMiff.