This patch starts adding support for network upgrades.

* It adds an actors abstraction layer for loading abstract (cross-version) actors.
* It starts switching over to a shared deadline type.
* It adds an abstraction for ADTs (hamt/amt).
* It removes the callback-based API in the StateManager (difficult to abstract
across actor versions).
* It _does not_ actually add support for actors v2. We can do that in a followup
patch but that should be relatively easy.

This patch is heavily WIP and does not compile. Feel free to push changes
directly to this branch.

Notes:

* State tree access now needs a network version, because the HAMT type will change.
* I haven't figured out a nice way to abstract over changes to the _message_
types. However, many of them will be type aliased to actors v0 in actors v2 so
we can likely continue using the v0 versions (or use the v2 versions
everywhere). I've been renaming imports to `v0*` to make it clear that we're
importing types from a _specific_ actors version.

TODO:

* Consider merging incremental improvements? We'd have to get this compiling
again first but we could merge in the new abstractions, and slowly switch over.
* Finish migrating to the new abstractions.
* Remove all actor state types from the public API. See `miner.State.Info()` for
the planned approach here.
* Fix the tests. This is likely going to be a massive pain.

build abstraction for paych actor and switch to using it in payment channel manager and state
predicates

…aych

Support Network Upgrades: Payment Channel

Update to abstract actor for markets state diffing. Also move the diff adt functions inside the
abstract actors

…arkets-deal-states

feat(market): update state diffing for market actor

complete markets conversion to using chain/actors types, also replacing DealProposal/DealState
interfaces with structs

Go does have some nice features, once in a while.

* Make diffing work across versions.
* Start porting more chainwatch logic.

`sed -i 's/\bv0\(\w\)\(\w*\)/\L\1\E\20/g' **/*.go`

1. Calling the specific partition/deadline APIs is faster.
2. It's _much_ easier to test this way.

…orPower

And avoid exposing "arrays" via the miner abstraction. We may change these
structures later.

This is a pretty big footgun.