v0.22: Hedge Fund, Jobs, Boosts, and music/sfx

# New venture: Hedge Fund

Added the Hedge Fund. In this venture you can invest lids into any of 6 different stocks, which go up and down in price randomly. Buy low and sell high to increase your lids.

# Added Jobs to the Bakery

Jobs will have you turn in cookies from your jar in exchange for lids. Click on the job and then click on cookies in your jar to turn them in. Once you complete the job, a new random one will take its place.

# Added Boosts

Boosts can be bought for lids and last for 5 minutes. Buying multiple of the same one will extend it a further 5 minutes.

- Jar of Jam: Next coin is +1 tier higher.

- Jar of Honey: Drop coins 25% faster.

- Jar of Chocolate: Increase merge multiplier by +50%.

# Added music and some sound effects

Added 6 music tracks and added sound effects for dropping and merging coins. Sounds and music can be muted by accessing the audio settings in the top-right corner.

# Other changes

Dropping a coin now earns 10 lids instead of 1. The number of lids you had previously has been multiplied by x10 to adjust for this.

Fixed a bug where promoting a coin caused the jar value to be incorrect.