Patch 0.12.320 - better narration, new cards, merchant rework

I added an intro. It shows a little background to the lore.

In the game, you could meet Iris. She is your companion and the main narrator of the story.

I also redesigned the merchant window. Now you can select one of the 5 cards. It should give you more controll.

Also, I have a couple of new cards for you. This gives a new mechanic: structure upgrades.

And that's all for now :) I hope you enjoy.

Full changes: - new merchant window

• new structure upgrades cards

• fix problems with the additional units panel

• increase pearls spawn rate

• new increase production cards

• add intro

• add more narration

• fix multiplayer problems

• fix new multiplayer demiurges