Content update and bug fixes!

Added a new NPC - Pills Merchant. With their help, you can strengthen your character. The assortment of stores has also been expanded, some bugs have been fixed. List of changes: *Added a new NPC - Pills Merchant. He spawns randomly some days. Found in hallways; *Added many new items of food, pills and more; *Assortment of all stores has been expanded; *Strength now grants 15 damage points instead of 5; *Endurance now grants 5 stamina recovery per second, up from 2; *Now "Explore" consumes less needs; *Experience system has been changed. Less experience is now required to level up; *Added help in the main menu and in the beginning of the game; *Fixed a bug with incorrect display of progress for some girls; I also thank all the players for their support!