Add speed Hud element (#164)

# Pull Request Guidelines

### This is a template, modify before submitting your PR

### Description
Adds a HUD element that displays the current players speed. Can
configure to measure in different speed units.

Ensure that your title is concise and has all the necessary information

Author: IceTank

src/main/kotlin/com/lambda/module/hud/Speed.kt

@@ -0,0 +1,67 @@
+/*
+ * Copyright 2025 Lambda
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.lambda.module.hud
+
+import com.lambda.event.events.TickEvent
+import com.lambda.event.listener.SafeListener.Companion.listen
+import com.lambda.gui.dsl.ImGuiBuilder
+import com.lambda.module.HudModule
+import com.lambda.module.tag.ModuleTag
+import com.lambda.threading.runSafe
+import com.lambda.util.SpeedUnit
+import net.minecraft.util.math.Vec3d
+
+object Speed : HudModule(
+    name = "Speed",
+    description = "Displays player speed",
+    tag = ModuleTag.HUD
+) {
+    var speedUnit by setting("Speed Unit", SpeedUnit.MetersPerSecond)
+    var onlyHorizontal by setting("Horizontal Speed", false, description = "Only consider horizontal movement for speed calculation")
+
+    var previousPos: Vec3d = Vec3d.ZERO
+    var currentPos: Vec3d = Vec3d.ZERO
+    var speed: Double = 0.0
+
+    init {
+        listen<TickEvent.Post> {
+            previousPos = currentPos
+            currentPos = player.pos
+
+            var vecDelta = player.pos.subtract(previousPos)
+            if (onlyHorizontal) {
+                vecDelta = Vec3d(vecDelta.x, 0.0, vecDelta.z)
+            }
+            speed = speedUnit.convertFromMinecraft(vecDelta.length())
+        }
+
+        onEnable {
+            previousPos = player.pos
+            currentPos = player.pos
+            speed = 0.0
+        }
+
+        onDisable { speed = 0.0 }
+    }
+
+    override fun ImGuiBuilder.buildLayout() {
+        runSafe {
+            text("Speed: %.2f %s".format(speed, speedUnit.unitName))
+        }
+    }
+}

src/main/kotlin/com/lambda/util/SpeedUnit.kt

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2025 Lambda
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.lambda.util
+
+enum class SpeedUnit(override val displayName: String, val conversionFromBlocksPerTick: Float, val unitName: String) : NamedEnum {
+    BlocksPerTick("Blocks Per Tick",1.0F, "bpt"),
+    BlocksPerSecond("Blocks Per Second", 0.05F, "bps"),
+    MetersPerSecond("Meters Per Second", 0.05F, "ms"),
+    KilometersPerHour("Kilometers Per Hour", 0.277778F * 0.05F, "kmh"),
+    MilesPerHour("Miles Per Hour", 0.44704F * 0.05F, "mph"),
+    Boeing787AtTakeoffSpeed("Boeing 787 Takeoff Speed", 84.9F * 0.05F, "Boeing 787s");
+
+    /**
+     * Converts the given speed in blocks per tick to the unit of this SpeedUnit.
+     * @param speedInBlocksPerTick
+     * @return
+     */
+    fun convertFromMinecraft(speedInBlocksPerTick: Double): Double {
+        return speedInBlocksPerTick / conversionFromBlocksPerTick
+    }
+}