new item type, "Dynamic Item"; working text terminal

Former-commit-id: 81e6d836f5f1e6490027d38146a32d404cf9ce3e
Former-commit-id: af6557340f9cd0ea0b67eb7a8825aeffe75f9d82

src/net/torvald/terrarum/gameworld/MapPoint.kt

@@ -0,0 +1,35 @@
+package net.torvald.terrarum.gameworld
+
+import net.torvald.point.Point2d
+
+import java.io.Serializable
+
+
+class MapPoint {
+    var startPoint: Point2d? = null
+        private set
+    var endPoint: Point2d? = null
+        private set
+
+    constructor() {
+
+    }
+
+    constructor(p1: Point2d, p2: Point2d) {
+        setPoint(p1, p2)
+    }
+
+    constructor(x1: Int, y1: Int, x2: Int, y2: Int) {
+        setPoint(x1, y1, x2, y2)
+    }
+
+    fun setPoint(p1: Point2d, p2: Point2d) {
+        startPoint = p1
+        endPoint = p2
+    }
+
+    fun setPoint(x1: Int, y1: Int, x2: Int, y2: Int) {
+        startPoint = Point2d(x1.toDouble(), y1.toDouble())
+        endPoint = Point2d(x2.toDouble(), y2.toDouble())
+    }
+}