Added a tileset builder

Builder/src/fmon/builder/package.scala

@@ -0,0 +1,14 @@
+package fmon
+
+import scalafx.Includes._
+import scalafx.scene.control._
+
+package object builder {
+  def getSelected[T](view: ListView[T]): T = {
+    view.selectionModel().selectedItem()
+  }
+  
+  def getSelected[T](view: ComboBox[T]): T = {
+    view.selectionModel().selectedItem()
+  }
+}