Add skill type enumeration and update skill management for throw skills

resources/skills/brick_throw.tres

@@ -18,3 +18,4 @@ config = {
 }
 cost = 50
 icon = ExtResource("2_yimbq")
+type = 1

resources/skills/explosive_brick.tres

@@ -19,3 +19,4 @@ config = {
 }
 cost = 180
 icon = ExtResource("3_wkqmb")
+type = 1

resources/skills/fire_brick.tres

@@ -19,3 +19,4 @@ config = {
 }
 cost = 150
 icon = ExtResource("3_w87qb")
+type = 1

resources/skills/ice_brick.tres

@@ -19,3 +19,4 @@ config = {
 }
 cost = 150
 icon = ExtResource("3_6btth")
+type = 1

resources/skills/magnetic.tres

@@ -16,3 +16,4 @@ config = {
 }
 cost = 70
 icon = ExtResource("1_16qcg")
+type = 2