add timeout to `use`

[earthiverse]

Changes:

• Add additional pot_timeout eval when use hp/mp is on cooldown
• Return ms with the remaining cooldown time in game_response for use hp/mp

[earthiverse]

Tested locally

[earthiverse]

Hmm... The cooldown bar is kind of weird, maybe the additional eval should be removed.

This was with me manually calling use('regen_mp') over and over. The eval resets the bar and it fills up based on how many ms are lefft.

[FreezePhoenix]

Why are we still using eval for potions? Also, I agree with Telokis, it should maybe jump the potion bar to the appropriate percentage, instead of just resetting it. You'd have to consider that there are different potion cooldowns for different actions, etc.