Add World.initMinimal

src/world.zig

@@ -32,6 +32,13 @@ pub fn World(comptime ctx: anytype) type {
             return result;
         }
 
+        pub fn initMinimal(alloc: Allocator) !*Self {
+            var result = try alloc.create(Self);
+            result.raw = c.ecs_mini().?;
+            result.allocator = alloc;
+            return result;
+        }
+
         pub fn deinit(self: *Self) void {
             _ = c.ecs_fini(self.raw);
             self.allocator.destroy(self);