Fix curse message for Eyes of the Overworld and lenses

"They are cursed" rather than "It is cursed."
Show 'take off' in inv action menu of meat rings
Enable trap/water/lava warnings when stunned/confused

... but only in the player's intended direction.

Before this, stumbling sideways into a trap still gave a trap warning
that could stop the move, and being stunned/confused just disabled the
water/lava prompts.

Now, traps/water/lava warnings check the direction before stun/confusion
randomizes it, warns only for that adjacent tile, and DOES NOT prevent
stumbling sideways into a trap/water/lava!