Refactor all (demo) runtime modules to use new storage (#98)

* Completely rework dispatch mechanism into something modular.

Not yet complete but 75% there.

* Council vote tests.

* Fix tests.

* whitespace.

* Fix demo runtime tests.

* Fix up tests.

* Remove dead code.

* Timestamp uses new storage API.

* Move over system module to new API.

* Much nicer storage API, moved over staking module.

* More refactoring.

* Democracy uses new storage API.

* Council uses new RPC.

* Fix more tests.

* Use match for Id

* Use match for Id

* Make PrivPass better protected.

* Address other grumbles.

* Give PrivPass a private member.

* Testing PrivPass.

* Add docs.

* Recompile binaries after merge.

* Remove duplicated code.

* New binaries.

* Docs

* Docs

* avoid use of (arguably) confusing terminology.