Fix nitpicks in Mining plugin

Also adds equals() and hashcode() implementations to the various
Mining actions.

game/plugin/skills/mining/src/pickaxe.kt

@@ -1,23 +1,27 @@
 package org.apollo.game.plugin.skills.mining
 
-import org.apollo.game.model.Animation;
+import org.apollo.game.model.Animation
+import org.apollo.game.model.entity.Player
+import org.apollo.game.plugin.api.mining
 
-enum class Pickaxe(val id: Int, val level: Int, val animation: Animation, val pulses: Int) {
-    RUNE(1275, 41, Animation(624), 3),
-    ADAMANT(1271, 31, Animation(628), 4),
-    MITHRIL(1273, 21, Animation(629), 5),
-    STEEL(1269, 1, Animation(627), 6),
-    ITRON(1267, 1, Animation(626), 7),
-    BRONZE(1265, 1, Animation(625), 8)
+enum class Pickaxe(val id: Int, val level: Int, animation: Int, val pulses: Int) {
+    BRONZE(id = 1265, level = 1, animation = 625, pulses = 8),
+    ITRON(id = 1267, level = 1, animation = 626, pulses = 7),
+    STEEL(id = 1269, level = 1, animation = 627, pulses = 6),
+    MITHRIL(id = 1273, level = 21, animation = 629, pulses = 5),
+    ADAMANT(id = 1271, level = 31, animation = 628, pulses = 4),
+    RUNE(id = 1275, level = 41, animation = 624, pulses = 3);
+
+    val animation = Animation(animation)
+
+    companion object {
+        private val PICKAXES = Pickaxe.values().sortedByDescending { it.level }
+
+        fun bestFor(player: Player): Pickaxe? {
+            return PICKAXES.asSequence()
+                .filter { it.level <= player.mining.current }
+                .filter { player.equipment.contains(it.id) || player.inventory.contains(it.id) }
+                .firstOrNull()
+        }
+    }
 }
-
-val PICKAXES = Pickaxe.values()
-
-
-
-fun getPickaxes(): Array<Pickaxe> {
-    return PICKAXES
-}
-
-fun lookupPickaxe(id: Int): Pickaxe? = PICKAXES.find { it.id == id }
-