add back sneak fall feature (for merge)

This reverts commit fe8dadc.

Author: Lamby777

src/main/java/net/wurstclient/hacks/GlideHack.java

@@ -19,13 +19,20 @@
 import net.wurstclient.events.AirStrafingSpeedListener;
 import net.wurstclient.events.UpdateListener;
 import net.wurstclient.hack.Hack;
+import net.wurstclient.settings.CheckboxSetting;
 import net.wurstclient.settings.SliderSetting;
 import net.wurstclient.settings.SliderSetting.ValueDisplay;
 import net.wurstclient.util.BlockUtils;
 
 public final class GlideHack extends Hack
 	implements UpdateListener, AirStrafingSpeedListener
 {
+	private final CheckboxSetting doSneakFall =
+		new CheckboxSetting("Temporary Disable",
+			"Temporarily disable this hack using your crouch button.\n"
+				+ "Turn off if you want to glide while crouching.",
+			true);
+	
 	private final SliderSetting fallSpeed = new SliderSetting("Fall speed",
 		0.125, 0.005, 0.25, 0.005, ValueDisplay.DECIMAL);
 
@@ -42,6 +49,7 @@ public GlideHack()
 		super("Glide");
 
 		setCategory(Category.MOVEMENT);
+		addSetting(doSneakFall);
 		addSetting(fallSpeed);
 		addSetting(moveSpeed);
 		addSetting(minHeight);
@@ -65,6 +73,12 @@ protected void onDisable()
 	public void onUpdate()
 	{
 		ClientPlayerEntity player = MC.player;
+		
+		if(doSneakFall.isChecked() && player.isSneaking())
+		{
+			return;
+		}
+		
 		Vec3d v = player.getVelocity();
 
 		if(player.isOnGround() || player.isTouchingWater() || player.isInLava()