Add fishing particle highlighter

Currently does not work when sneaking or when the bobber moves too much, since the position desyncs with the server

src/test/kotlin/AngleTest.kt

@@ -0,0 +1,28 @@
+import kotlin.math.atan
+
+private fun calculateAngleFromOffsets(xOffset: Double, zOffset: Double): Double {
+    var angleX = Math.toDegrees(Math.acos(xOffset / 0.04f))
+    var angleZ = Math.toDegrees(Math.asin(zOffset / 0.04f))
+    if (xOffset < 0) {
+        angleZ = 180 - angleZ
+    }
+    if (zOffset < 0) {
+        angleX = 360 - angleX
+    }
+    angleX %= 360.0
+    angleZ %= 360.0
+    if (angleX < 0) angleX += 360.0
+    if (angleZ < 0) angleZ += 360.0
+    var dist = angleX - angleZ
+    if (dist < -180) dist += 360.0
+    if (dist > 180) dist -= 360.0
+    return angleZ + dist / 2
+}
+
+fun main() {
+    for(i in 0..10) {
+        for (j in 0..10) {
+            println("${calculateAngleFromOffsets(i.toDouble(),j.toDouble())} ${atan(i.toDouble() / j.toDouble())}")
+        }
+    }
+}