Dynamic names support (#49)

* Dynamic names support

* Add support for dynamic names in parent tags

* Support all dynamic names spec

* Swift 5.8 compile fix

Tests/MustacheTests/SpecTests.swift

@@ -69,7 +69,7 @@ final class MustacheSpecTests: XCTestCase {
             let expected: String
 
             func run() throws {
-                // print("Test: \(self.name)")
+                print("Test: \(self.name)")
                 if let partials = self.partials {
                     let template = try MustacheTemplate(string: self.template)
                     var templates: [String: MustacheTemplate] = ["__test__": template]
@@ -188,4 +188,8 @@ final class MustacheSpecTests: XCTestCase {
             ]
         )
     }
+
+    func testDynamicNamesSpec() async throws {
+        try await self.testSpec(name: "~dynamic-names")
+    }
 }