Move projectiles to their own namespace and folder

While they are (currently) technically effects, this makes the actual purpose and wiki more clear.

OpenRA.Mods.RA/Projectiles/TeslaZap.cs

@@ -0,0 +1,76 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2016 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made
+ * available to you 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. For more
+ * information, see COPYING.
+ */
+#endregion
+
+using System.Collections.Generic;
+using OpenRA.Effects;
+using OpenRA.GameRules;
+using OpenRA.Graphics;
+using OpenRA.Mods.RA.Graphics;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.RA.Projectiles
+{
+	class TeslaZapInfo : IProjectileInfo
+	{
+		public readonly string Image = "litning";
+
+		[SequenceReference("Image")] public readonly string BrightSequence = "bright";
+		[SequenceReference("Image")] public readonly string DimSequence = "dim";
+
+		[PaletteReference] public readonly string Palette = "effect";
+
+		public readonly int BrightZaps = 1;
+		public readonly int DimZaps = 2;
+
+		public IEffect Create(ProjectileArgs args) { return new TeslaZap(this, args); }
+	}
+
+	class TeslaZap : IEffect
+	{
+		readonly ProjectileArgs args;
+		readonly TeslaZapInfo info;
+		TeslaZapRenderable zap;
+		int timeUntilRemove = 2; // # of frames
+		bool doneDamage = false;
+		bool initialized = false;
+
+		public TeslaZap(TeslaZapInfo info, ProjectileArgs args)
+		{
+			this.args = args;
+			this.info = info;
+		}
+
+		public void Tick(World world)
+		{
+			if (timeUntilRemove-- <= 0)
+				world.AddFrameEndTask(w => w.Remove(this));
+
+			if (!doneDamage)
+			{
+				var pos = args.GuidedTarget.IsValidFor(args.SourceActor) ? args.GuidedTarget.CenterPosition : args.PassiveTarget;
+				args.Weapon.Impact(Target.FromPos(pos), args.SourceActor, args.DamageModifiers);
+				doneDamage = true;
+			}
+		}
+
+		public IEnumerable<IRenderable> Render(WorldRenderer wr)
+		{
+			if (!initialized)
+			{
+				var pos = args.GuidedTarget.IsValidFor(args.SourceActor) ? args.GuidedTarget.CenterPosition : args.PassiveTarget;
+				zap = new TeslaZapRenderable(args.Source, 0, pos - args.Source,
+					info.Image, info.BrightSequence, info.BrightZaps, info.DimSequence, info.DimZaps, info.Palette);
+			}
+
+			yield return zap;
+		}
+	}
+}