Support new versioned metadata format (#632)

* Start something...

* Parsing via proxy (everything still all-ok)

* Imp[ort order (minor)

* WIP expanding the structure

* Adjust V1 structure

* Parsing seems to do the trick...

* Add CodeHash and Schedule types

* //v0/ -> /v0/

* Update Extrinsic.ts

* Updated with compact outerDispatch, non-throw construction

* v1 to V0 conversion

* Bubble non-magic errors in constructor

* Update e2e after testing them

* Bump version with CHANGELOG  (potentially breaking change)

packages/api-derive/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/api-derive",
-  "version": "0.40.26",
+  "version": "0.41.0",
   "description": "Common functions used across Polkadot, derived from RPC calls and storage queries.",
   "main": "index.js",
   "keywords": [
@@ -31,8 +31,8 @@
   "homepage": "https://github.com/polkadot-js/api/tree/master/packages/api-derive#readme",
   "dependencies": {
     "@babel/runtime": "^7.2.0",
-    "@polkadot/api": "^0.40.26",
-    "@polkadot/types": "^0.40.26",
+    "@polkadot/api": "^0.41.0",
+    "@polkadot/types": "^0.41.0",
     "@types/memoizee": "^0.4.2",
     "@types/rx": "^4.1.1",
     "memoizee": "^0.4.14",