Completely rewritten joystick input

- Joystick input is now processed using polar coordinates, resulting in better accuracy and fixing tons of issues (Fixes #135, #138, #186 & #180)
- Camera movement is now way smoother by including the previous stick values in the calculation (Fixes #217 & #167)
- updateMappings() is now called asyncronously (Closes #219)

src/main/java/eu/midnightdust/midnightcontrols/client/util/MathUtil.java

@@ -0,0 +1,23 @@
+package eu.midnightdust.midnightcontrols.client.util;
+
+import net.minecraft.util.math.MathHelper;
+
+public class MathUtil {
+    public static class PolarUtil {
+        public float polarX;
+        public float polarY;
+        public PolarUtil() {}
+
+        public void calculate(float x, float y, float speedFactor) {
+            calculate(x, y, speedFactor, 0);
+        }
+        public void calculate(float x, float y, float speedFactor, double deadZone) {
+            double inputR = Math.pow(x, 2) + Math.pow(y, 2);
+            inputR = (Math.abs(speedFactor * MathHelper.clamp(inputR,0.f,1.f)));
+            inputR = inputR < deadZone ? 0f : (inputR-deadZone) / (1f-deadZone);
+            double inputTheta = Math.atan2(y, x);
+            polarX = (float) (inputR *Math.cos(inputTheta));
+            polarY = (float) (inputR *Math.sin(inputTheta));
+        }
+    }
+}