Remove util:lookup plugin

Behaviour moved into the api plugin.

game/plugin/api/test/NamedLookupTests.kt

@@ -0,0 +1,17 @@
+import org.apollo.cache.def.ItemDefinition
+import org.apollo.game.plugin.api.Definitions
+import org.apollo.game.plugin.testing.KotlinPluginTest
+import org.assertj.core.api.Assertions.assertThat
+import org.junit.Test
+
+class NamedLookupTests : KotlinPluginTest() {
+    @Test
+    fun itemLookup() {
+        val testItem = ItemDefinition(0)
+        testItem.name = "sword"
+
+        ItemDefinition.init(arrayOf(testItem))
+
+        assertThat(Definitions.item("sword")).isEqualTo(testItem)
+    }
+}