Brought in screen manager, minor refactor.

gamedata/coordinates.go

@@ -0,0 +1,6 @@
+package gamedata
+
+type Coordinates struct {
+	X float64
+	Y float64
+}

gamedata/gameinfo.go

@@ -0,0 +1,16 @@
+package gamedata
+
+type Area struct {
+	Width  int
+	Height int
+}
+
+func (a *Area) Area() int {
+	return a.Height * a.Width
+}
+
+type GameInfo struct {
+	Name       string
+	Version    string
+	Dimensions Area
+}