add function to check if there is an open menu (#33)

Co-authored-by: Héctor Giménez <hector.fwbz@gmail.com>

pkg/data/data.go

@@ -303,3 +303,7 @@ type OpenMenus struct {
 	SkillSelect   bool
 	Anvil         bool
 }
+
+func (om OpenMenus) IsMenuOpen() bool {
+	return om.Inventory || om.NPCInteract || om.NPCShop || om.Stash || om.Waypoint || om.SkillTree || om.Character || om.QuitMenu || om.Cube || om.SkillSelect || om.Anvil
+}