Add slot locking

src/main/kotlin/moe/nea/firmament/events/IsSlotProtectedEvent.kt

@@ -0,0 +1,26 @@
+package moe.nea.firmament.events
+
+import net.minecraft.screen.slot.Slot
+import net.minecraft.text.Text
+import moe.nea.firmament.util.CommonSoundEffects
+import moe.nea.firmament.util.MC
+
+data class IsSlotProtectedEvent(
+    val slot: Slot, var isProtected: Boolean = false
+) : FirmamentEvent() {
+    companion object : FirmamentEventBus<IsSlotProtectedEvent>() {
+        @JvmStatic
+        fun shouldBlockInteraction(slot: Slot): Boolean {
+            return publish(IsSlotProtectedEvent(slot)).isProtected.also {
+                if (it) {
+                    MC.player?.sendMessage(Text.translatable("firmament.protectitem").append(slot.stack.name))
+                    CommonSoundEffects.playFailure()
+                }
+            }
+        }
+    }
+
+    fun protect() {
+        isProtected = true
+    }
+}