v0.20: Introducing abilities

# Added abilities

Abilities are powers you can use directly on coins in the jar. They cost either cookies or chips and the cost goes up every time you use the ability.

We're starting with 4 in this update: Promote Coin, Delete Coin, Merge Coins, and Teleport Coin.

## Promote Coin

Turns the coin you select into the next-higher coin e.g. 32 -> 64

## Delete Coin

Removes the coin from the jar. Useful when a troublesome coin is in the way of merging two bigger coins.

## Merge Coins

Merges the selected coin with all coins touching it. The new coin is the sum of all the coins, rounded up to the nearest power of 2.

## Teleport Coin

Teleports the selected coin to its nearest twin (coin with the same value) merging them instantly.

More abilities will be added soon.

# Other changes

Added some upgrades to the Bakery that increase building efficiency.