refactor (#6)

Reviewed-on: #6

scripts/Resources/CollectableResource.cs

@@ -6,4 +6,9 @@ public partial class CollectableResource : Resource
 {
     [Export] public float Amount { get; set; } = 0.0f;
     [Export] public CollectableType Type { get; set; }
+
+    /// <summary>
+    /// The skill to unlock when collected. Only used when Type is Skill.
+    /// </summary>
+    [Export] public SkillData Skill { get; set; }
 }

scripts/Resources/CollectableType.cs

@@ -5,4 +5,5 @@ public enum CollectableType
     Coin,
     Kid,
     Health,
+    Skill,
 }

scripts/Resources/SkillData.cs

@@ -10,11 +10,10 @@ public partial class SkillData : Resource
     [Export] public string Name { get; set; } = "New Skill";
     [Export] public string Description { get; set; } = "New Skill";
     [Export] public Texture2D Icon { get; set; }
-    [Export] public bool IsActive { get; set; } = false;
     [Export] public int Level { get; set; } = 1;
     [Export] public SkillType Type { get; set; } = SkillType.Throw;
     [Export] public PackedScene Node { get; set; }
     [Export] public Array<SkillUpgrade> Upgrades { get; set; } = [];
-    
+
     public int MaxLevel => Upgrades.Count;
 }