Add slot locking

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

@@ -0,0 +1,10 @@
+package moe.nea.firmament.events
+
+import net.minecraft.client.option.KeyBinding
+
+data class HandledScreenKeyPressedEvent(val keyCode: Int, val scanCode: Int, val modifiers: Int) : FirmamentEvent.Cancellable() {
+    companion object : FirmamentEventBus<HandledScreenKeyPressedEvent>()
+    fun matches(keyBinding: KeyBinding): Boolean {
+        return keyBinding.matchesKey(keyCode, scanCode)
+    }
+}