compound joysticks, button guide in screens, improve API

src/main/java/dev/isxander/controlify/controller/joystick/SingleJoystickController.java

@@ -0,0 +1,83 @@
+package dev.isxander.controlify.controller.joystick;
+
+import com.google.gson.Gson;
+import com.google.gson.JsonElement;
+import dev.isxander.controlify.controller.AbstractController;
+import dev.isxander.controlify.controller.hid.ControllerHIDService;
+import dev.isxander.controlify.controller.joystick.mapping.RPJoystickMapping;
+import dev.isxander.controlify.controller.joystick.mapping.JoystickMapping;
+import dev.isxander.controlify.controller.joystick.mapping.UnmappedJoystickMapping;
+import org.lwjgl.glfw.GLFW;
+
+import java.util.Objects;
+
+public class SingleJoystickController extends AbstractController<JoystickState, JoystickConfig> implements JoystickController<JoystickConfig> {
+    private JoystickState state = JoystickState.EMPTY, prevState = JoystickState.EMPTY;
+    private final int axisCount, buttonCount, hatCount;
+    private final JoystickMapping mapping;
+
+    public SingleJoystickController(int joystickId, ControllerHIDService.ControllerHIDInfo hidInfo) {
+        super(joystickId, hidInfo);
+
+        this.axisCount = GLFW.glfwGetJoystickAxes(joystickId).capacity();
+        this.buttonCount = GLFW.glfwGetJoystickButtons(joystickId).capacity();
+        this.hatCount = GLFW.glfwGetJoystickHats(joystickId).capacity();
+
+        this.mapping = Objects.requireNonNull(RPJoystickMapping.fromType(type()));
+        
+        this.config = new JoystickConfig(this);
+        this.defaultConfig = new JoystickConfig(this);
+    }
+
+    @Override
+    public JoystickState state() {
+        return state;
+    }
+
+    @Override
+    public JoystickState prevState() {
+        return prevState;
+    }
+
+    @Override
+    public void updateState() {
+        prevState = state;
+        state = JoystickState.fromJoystick(this, joystickId);
+    }
+
+    @Override
+    public void clearState() {
+        this.state = JoystickState.empty(this);
+    }
+
+    @Override
+    public JoystickMapping mapping() {
+        return mapping;
+    }
+
+    @Override
+    public int axisCount() {
+        return axisCount;
+    }
+
+    @Override
+    public int buttonCount() {
+        return buttonCount;
+    }
+
+    @Override
+    public int hatCount() {
+        return hatCount;
+    }
+
+    @Override
+    public int joystickId() {
+        return joystickId;
+    }
+
+    @Override
+    public void setConfig(Gson gson, JsonElement json) {
+        super.setConfig(gson, json);
+        this.config.setup(this);
+    }
+}