Change $This variable to $this

src/gaemstone.ECS/Rule.cs

@@ -52,9 +52,9 @@ public unsafe class Rule<TContext>
 
 		internal VariableCollection(ecs_rule_t* handle)
 		{
-			// Find the $This variable, if the rule has one.
+			// Find the $this variable, if the rule has one.
 			var thisIndex = ecs_filter_find_this_var(ecs_rule_get_filter(handle));
-			if (thisIndex >= 0) _variables.Add(new(thisIndex, "This"));
+			if (thisIndex >= 0) _variables.Add(new(thisIndex, "this"));
 
 			// Find all the other "accessible" variables.
 			var count = ecs_rule_var_count(handle);

src/gaemstone.ECS/Term.cs

@@ -61,7 +61,7 @@ public enum TermOperKind
 
 public class TermId
 {
-	public static TermId This { get; } = new("$This");
+	public static TermId This { get; } = new("$this");
 
 	public Entity Id { get; }
 	public string? Name { get; }