Add Equatable Tuple to tools

Sources/AOC2018/tools.swift

@@ -14,6 +14,10 @@ func XCTAssertEqual(test: String, withExpression isTrue: Bool) {
     print(test)
 }
 
+func == <T:Equatable> (tuple1:(T,T),tuple2:(T,T)) -> Bool
+{
+   return (tuple1.0 == tuple2.0) && (tuple1.1 == tuple2.1)
+}
 
 struct Tools {
     static func readFile(fromPath path: String) -> String {