Add mines

[WilliamQiufeng]

Adds a field Type: HitObjectType that indicates whether the hit object is a Normal note or a Mine. With this design you would actually be able to make long mines? When the player is pressing on the lane where a mine is present, and the timing falls into the marvelous timing window, then it is considered a miss. If the player does not press the mine and passes the marvelous window of the mine, a marvelous judgement is generated, indicating that the mine is not set off.