Refactor to use better interfaces and event callbacks.

elements/enemies.go

@@ -0,0 +1,23 @@
+package elements
+
+import (
+	"mover/gamedata"
+
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+type Enemies interface {
+	Update() error
+	Draw()
+	GetPosition() gamedata.Coordinates
+	SetPosition(gamedata.Coordinates)
+	SetTarget(gamedata.Coordinates)
+	GetSprite() *ebiten.Image
+	GetEnemyState() gamedata.EnemyState
+	SetHit()
+	SetToggle()
+	IsToggled() bool
+	SetTouched()
+	ClearTouched()
+	IsTouched() bool
+}