Moved example physics stuff into the sample game

SampleGame/src/physics/Solid.bf

@@ -0,0 +1,94 @@
+using System.Collections;
+
+namespace Strawberry.Sample
+{
+	public class Solid : Geometry
+	{
+		public this(Point position, Rect hitbox)
+			: base(position)
+		{
+			Hitbox = hitbox;
+		}
+
+		public override List<Actor> GetRiders(List<Actor> into)
+		{
+			for (var a in Scene.All<Actor>(scope List<Actor>()))
+				if (a.IsRiding(this))
+					into.Add(a);
+			return into;
+		}
+
+		public override void MoveExactX(int amount)
+		{
+			if (Collidable)
+			{
+				let riders = GetRiders(scope List<Actor>());
+
+				X += amount;
+				Collidable = false;
+
+				for (Actor a in Scene.All<Actor>(scope List<Actor>()))
+				{
+					if (Check(a))
+					{
+						//Push
+						int move;
+						if (amount > 0)
+							move = Right - a.Left;
+						else
+							move = Left - a.Right;
+						a.MoveExactX(move, scope => a.Squish, this);
+					}
+					else if (riders.Contains(a))
+					{
+						//Carry
+						a.MoveExactX(amount, null, null, this);
+					}
+				}
+
+				Collidable = true;
+			}
+			else
+				X += amount;
+		}
+
+		public override void MoveExactY(int amount)
+		{
+			if (Collidable)
+			{
+				let riders = GetRiders(scope List<Actor>());
+
+				Y += amount;
+				Collidable = false;
+
+				for (Actor a in Scene.All<Actor>(scope List<Actor>()))
+				{
+					if (Check(a))
+					{
+						//Push
+						int move;
+						if (amount > 0)
+							move = Bottom - a.Top;
+						else
+							move = Top - a.Bottom;
+						a.MoveExactY(move, scope => a.Squish, this);
+					}
+					else if (riders.Contains(a))
+					{
+						//Carry
+						a.MoveExactY(amount, null, null, this);
+					}
+				}
+
+				Collidable = true;
+			}
+			else
+				Y += amount;
+		}
+
+		public override void Draw()
+		{
+			DrawHitbox(.White);
+		}
+	}
+}