Selling stock improvements

[x] Add quick-buttons based on how many you have
[x] 25%, 50%, all
[x] Limit through interface that you can write a number higher than what you have (If you do - get max)
[x] Improve payout view. Make a cool dollar out effect
[x] Toast following purchase/sell needs to be bigger. The dollar-number needs to be BIG

Grymse / fake-stocks