added difficulty options, changing droprate and descending speed based on it
using player.cs now, moved controls of the playerblock into the player.cs
added playerList which holds the player.cs instances.
changed a bit in the mainLoop_Tick, it loops through all of the playerList
and then checks controls for the playerif its number is 1 (local player),
added "addPlayer" method which add a new playerBlock Instance to the screen
and to the playerList