added HorizontalLengthSquared() to Vector3 and fixed MutableAABB retu…

…rn types

MineSharp.Core/Geometry/AABB.cs

@@ -201,7 +201,7 @@ public MutableAABB(double minX, double minY, double minZ, double maxX, double ma
     /// Deflate this bounding box by <paramref name="x"/>, <paramref name="y"/>, <paramref name="z"/>
     /// Mutates this instance.
     /// </summary>
-    public AABB Deflate(double x, double y, double z)
+    public MutableAABB Deflate(double x, double y, double z)
     {
         this.Min.Add(x, y, z);
         this.Max.Add(-x, -y, -z);
@@ -212,7 +212,7 @@ public AABB Deflate(double x, double y, double z)
     /// <summary>
     /// Expand this bounding box by x, y, z
     /// </summary>
-    public AABB Expand(double x, double y, double z)
+    public MutableAABB Expand(double x, double y, double z)
     {
         if (x > 0)
             this.Max.Add(x, 0, 0);
@@ -233,11 +233,7 @@ public AABB Expand(double x, double y, double z)
     /// Offset this bounding box by <paramref name="x"/>, <paramref name="y"/>, <paramref name="z"/>.
     /// Mutates this instance.
     /// </summary>
-    /// <param name="x"></param>
-    /// <param name="y"></param>
-    /// <param name="z"></param>
-    /// <returns></returns>
-    public AABB Offset(double x, double y, double z)
+    public MutableAABB Offset(double x, double y, double z)
     {
         this.Min.Add(x, y, z);
         this.Max.Add(x, y, z);

MineSharp.Core/Geometry/Vector3.cs

@@ -148,6 +148,13 @@ public double Length()
     public double LengthSquared()
         => this.X * this.X + this.Y * this.Y + this.Z * this.Z;
 
+    /// <summary>
+    /// Calculates the squared horizontal (x, z) length of this vector instance
+    /// </summary>
+    [Pure]
+    public double HorizontalLengthSquared()
+        => this.X * this.X + this.Z * this.Z;
+
     /// <summary>
     /// Calculates the horizontal squared length of this vector
     /// </summary>