v0.19: Back to the drawing board

# Items removed, ventures revamped

After playtesting the last update, I realized that it's not very fun to drop things that are not coins into the jar. They just make it harder to merge when there are too many incompatible things. And the whole point of the game was supposed to be merging things. So I think it's time to focus on that again.

The ventures themselves were also boring and samey. So I'm starting over with them.

From now on, each venture is going to introduce a different and interesting new thing to do in the game. So we're starting with 2 in this update: the bakery and the casino.

The bakery contains a little Cookie Clicker clone. You'll buy buildings like cookie mines and cookie farms to automate the collection of cookies.

The casino has a Video Poker machine. You can wager chips to try to earn more chips, and the highest hand you achieve permanently boosts your chip merge multiplier. More casino games will come.

# Points Bank have been consolidated into just "Coins"

It was confusing to have one currency (points) earned by merging and another (bank) earned by emptying the jar. So now merging and emptying grant the same currency.

# More currencies: Cookies and Chips

Some ventures will introduce a new currency. You simply click on the currency in the top-left of the screen to switch your coins in the jar to that currency. You can switch back and forth as you wish, depending on which currency you want to get. Different upgrades and activities in the game will cost different currencies.

# Mobile layout makeover

Significant changes were made to the UI when playing on a phone screen. The drawer has been replaced with simple buttons that make it much quicker/easier to navigate. Various parts of the UI have been repositioned.