Renamed the constant ICGCFS to SCOREFS

[Azher2Ali]

Rename the Constant: #420

The constant ICGCFS was renamed to SCOREFS. This means anywhere ICGCFS was used, it is now replaced by SCOREFS and The value assigned to the constant was changed from "icgcfs" to "scorefs" and the return statement was modified to return the new constant SCOREFS instead of the old constant ICGCFS

[joneubank]

Looks good. While we're makign changes to this file can we also update the getName response?

score/score-fs/src/main/java/bio/overture/score/fs/StorageFileStore.java

Lines 45 to 47 in f931ebe

	public String name() {
	return "icgc";
	}