Refactor model

Sources/SwiftUIMath/Internal/Model/Atoms/LargeOperator.swift

@@ -0,0 +1,17 @@
+import Foundation
+
+extension Math {
+  final class LargeOperator: Atom {
+    var limits: Bool
+
+    init(_ largeOperator: LargeOperator) {
+      self.limits = largeOperator.limits
+      super.init(largeOperator)
+    }
+
+    init(limits: Bool = false) {
+      self.limits = limits
+      super.init(type: .largeOperator)
+    }
+  }
+}