v6.0.0 Beta 1

A new major version! This is based on published changes from the original upstream project which included a lot of refactoring and cleanup work.

BREAKING CHANGES

• 📦 Package is now published as ESM only. UMD build has been removed.
• 💥 remove sizeof, display, c-struct, windows type
• 🔨 remove StructBuffer.structName attribute
• 🔨 remove StructType.names attribute

Other changes

• ✨ add LittleEndian and RelativeOffset. See unit tests for example usage
• ✅ ✔️ add test
• 🎨 improve code