Release v0.5.4

• a9414f8 Add deprecated notice to changelog
• 048e69a chore(release): 0.5.4
• cd7b4bc fix: "Fix" typo in event phase const name
• 9d43d9c refactor: Simplify removing slice element
• 654a995 cleanup: Remove unnecessary codegen config
• 58c61c1 refactor: Auto generate event JS wrappers
• 197d7d9 test: Cleanup remnants of code depending on ginko
• 1a677cd test: Convert scripttest tests
• 6945725 test: Convert script Document tests
• de3cc20 test: Convert ginkgo test to testify suite
• 5467955 refactor(codegen): Extract V8TargetGenerators
• 9e4cd47 refactor(codegen): Add idl.Type return type
• d92b1f2 chore(codegen): Updage webref dependency
• ce293b3 refactor(codegen): Remove useless local var
• 5718748 refactor(codegen): Add custom arg rule to JS gen
• 6510018 refactor(codegen): General cleanup
• 9b79a0a refactor(codegen): Extract engine generators
• b4512a6 refactor(codegen): Extract model generators
• 3ea5d30 refactor(codegen): Extract common generators
• 25373d4 refactor(codegen): Wrapper method gen control flow
• 24c3ed0 refactor(codegen): Extract wrapper method flow
• 5993d80 refactor(codegen): Move flow control of methods
• 927b417 refactor(codegen): Harmonise callback body intf
• 8a5cbb5 cleanup: Remove unused type
• effaeed dom: Implement SetInnerHTML
• a5276cf fix: InsertAdjacentHTML only handled elements
• 416470e cleanup: Remove unnecessary DOM parser logic
• d9d03a7 test(dom): Convert ginkgo tests for Element
• 08eafdd test: Fix bad caching of gomegas
• 36c87e1 test: Extract AssertFixture
• 2a5a843 docs: Update commit guidelines
• 555af5c test: Cleanup
• 0f62f8a test: Move variables to the owner fixture
• 038bcf5 test: Replace fixture with new package
• e7e5906 test: Refactor fixture component
• dcc903b cleanup: Remove Println statements
• ab7b038 docs: Rewrite commit guidelines
• 4303c1f Remove comments