Avoid resource depletion

[mattias-p]

There should be a renewable destructible that drops one of the following:

• A small magic flask
• A single bomb
• A single arrow
• Nothing

A pickable should only be dropped if the hero has the corresponding item, but is completely run out of the resource.

At least one of these destructibles should be reachable from the start of each level without solving any puzzles that requires any of the dropped resources.

[sandstrand]

We discussed trap puzzle rooms earlier, where if you press the wrong button/pull the wrong lever enemies would spawn. As long as these could be done over and over again and were accessible before any item obstacle room it would solve the problem.