Add long rest

Some levels require extreme long resting phases.

Some might consider it the charm of the game, forcing the player to press a button a few thousand times.

But, this being a very casual game, with just one play through a day makes it perfect for people who hunt have a few minutes to get a small daily gaming fix.

And we don't have the time 😅

So I propose a "long rest" button, that rests until the next point o health is gained, or simply 100 steps.

To make it not to easy, monsters shall keep moving. If a player starts resting in range of a monster, they will most certainly die.

I am willing to take a shot at this for a PR, but as mentioned, time is scarce.