Fixed server crash bug

This patch fixes a significant server crash bug.

Change log:
fix: Infinite server loop that occurred after you summoned
an urn and then died

fix: Cards in your inventory not decrementing in cost
when your turn ended
Thanks Matt_97 for help debugging this

fix: Resurrect Weak sometimes leaving enemy health and mana
at non-whole numbers

fix: Prevent Upgrade random number generator from showing the same upgrades if you get multiple level ups on the same level with a full toolbar