* Make a start ... V11 definitions
* V11 conversion
* Fix ErrorMetadataV11
* Extension point for signed extensions
* Add V11 to mapped
* Expand toLatest comments
* Make a start at signer extension defs
* exports
* Extract extension definitions
* Add extension registration
* Remove old override
* Get definition on extrinsic creation
* Add missing V4 base
* Optional extrinsic
* Pull extrinsic version from metadata (if available)
* asLatest.extrinsic should now be available
* Don't export non-types for Extrinsic
* Setup registry with default extensions
* Async test really runs async
* Trace test failures (V1 orig, V4 now)
* CHANGELOG
* Add extension data to actual signature
* Cleanups
* Return cleanups
* Mark all type deocde static internal
* Apply extensions fully to payload
* Cleanup duplication
* ExtrinsicSignature* via createType