Move source projects into source directory

source/MonoGame.Extended.Particles/Modifiers/Interpolators/ColorInterpolator.cs

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+namespace MonoGame.Extended.Particles.Modifiers.Interpolators
+{
+    /// <summary>
+    /// Defines a modifier which interpolates the color of a particle over the course of its lifetime.
+    /// </summary>
+    public sealed class ColorInterpolator : Interpolator<HslColor>
+    {
+        public override unsafe void Update(float amount, Particle* particle)
+        {
+            particle->Color = HslColor.Lerp(StartValue, EndValue, amount);
+        }
+    }
+}

source/MonoGame.Extended.Particles/Modifiers/Interpolators/HueInterpolator.cs

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+using MonoGame.Extended;
+
+namespace MonoGame.Extended.Particles.Modifiers.Interpolators
+{
+    public class HueInterpolator : Interpolator<float>
+    {
+        public override unsafe void Update(float amount, Particle* particle)
+        {
+            particle->Color = new HslColor((EndValue - StartValue) * amount + StartValue, particle->Color.S, particle->Color.L);
+        }
+    }
+}

source/MonoGame.Extended.Particles/Modifiers/Interpolators/Interpolator.cs

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+namespace MonoGame.Extended.Particles.Modifiers.Interpolators
+{
+    public abstract class Interpolator
+    {
+        protected Interpolator()
+        {
+            Name = GetType().Name;
+        }
+
+        public string Name { get; set; }
+        public abstract unsafe void Update(float amount, Particle* particle);
+    }
+
+    public abstract class Interpolator<T> : Interpolator
+    {
+        /// <summary>
+        /// Gets or sets the intial value when the particles are created.
+        /// </summary>
+        public virtual T StartValue { get; set; }
+
+        /// <summary>
+        /// Gets or sets the final value when the particles are retired.
+        /// </summary>
+        public virtual T EndValue { get; set; }
+    }
+}

source/MonoGame.Extended.Particles/Modifiers/Interpolators/OpacityInterpolator.cs

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+namespace MonoGame.Extended.Particles.Modifiers.Interpolators
+{
+    public class OpacityInterpolator : Interpolator<float>
+    {
+        public override unsafe void Update(float amount, Particle* particle)
+        {
+            particle->Opacity = (EndValue - StartValue) * amount + StartValue;
+        }
+    }
+}

source/MonoGame.Extended.Particles/Modifiers/Interpolators/RotationInterpolator.cs

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+namespace MonoGame.Extended.Particles.Modifiers.Interpolators
+{
+    public class RotationInterpolator : Interpolator<float>
+    {
+        public override unsafe void Update(float amount, Particle* particle)
+        {
+            particle->Rotation = (EndValue - StartValue) * amount + StartValue;
+        }
+    }
+}

source/MonoGame.Extended.Particles/Modifiers/Interpolators/ScaleInterpolator.cs

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+using Microsoft.Xna.Framework;
+
+namespace MonoGame.Extended.Particles.Modifiers.Interpolators
+{
+    public class ScaleInterpolator : Interpolator<Vector2>
+    {
+        public override unsafe void Update(float amount, Particle* particle)
+        {
+            particle->Scale = (EndValue - StartValue) * amount + StartValue;
+        }
+    }
+}

source/MonoGame.Extended.Particles/Modifiers/Interpolators/VelocityInterpolator

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+using Microsoft.Xna.Framework;
+
+namespace MonoGame.Extended.Particles.Modifiers.Interpolators
+{
+    public class VelocityInterpolator : Interpolator<Vector2>
+    {
+        public override unsafe void Update(float amount, Particle* particle)
+        {
+            particle->Velocity = (EndValue - StartValue) * amount + StartValue;
+        }
+    }
+}