Ecs changes

- BitArray has always at least sizeof(uint) bits
- Renamed Entity to EcsEntity
- Added value parameter to EcsWorld.AssignComponent
- Matched EcsWorld generic parameters
- Added Scene
- Added Entity

GlitchyEngine/src/World/EcsEntity.bf

@@ -0,0 +1,30 @@
+using System;
+
+using internal GlitchyEngine.World;
+
+namespace GlitchyEngine.World
+{
+	public struct EcsEntity : uint64
+	{	
+		// Binary Format:
+		// Bits: [0 - 31] [32 - 64]
+		// Data: Version    Index
+
+		[Inline]
+		internal uint32 Version => (uint32)this;
+
+		[Inline]
+		internal uint32 Index => (uint32)(this >> 32);
+		
+		[Inline]
+		static internal EcsEntity CreateEntityID(uint32 index, uint32 version)
+		{
+			return ((uint64)index << 32) | version;
+		}
+		
+		[Inline]
+		internal bool IsValid => Index != InvalidEntity.Index;
+
+		public const EcsEntity InvalidEntity = CreateEntityID(uint32.MaxValue, 0);
+	}
+}