New Updates - Stealth ASCII

New changes:
1. Stealth regeneration is much slower: 1 point every 5th turn instead of each turn
2. Player recovers most stealth (30 points) by entering new level
3. Guard field of view is now toggled every 4th turn from smaller to larger
4. Disguise potion has now limited duration instead of being infinite
5. If player keeps tarrying too long time, an extra guard will be spawned to the level, increasing difficulty
6. Objects player has revealed will stay visible