* Wrap all routes in toStrictEntity

This PR adds support for truncated integers as defined in the spec.
The test vectors are updated to include all test vectors from rusty's spec PR.
It also provides many changes to the tlv and tlv stream classes:

- The tlv trait doesn't need a type field, the codec should handle that
- A TLV stream should be scoped to a specific subtrait of tlv
- Stream validation is done inside the codec instead of the tlv stream: it makes it more convenient for application layers to create tlv streams and manipulate them

In a backward-compatible way, by using the fact that the first object of
a legacy `Commitments` was a public key, starting from 0x02 or 0x03.

We now store the channel version on a 8B bitfield prefixed by `0x01`

When we want to fulfill an HTLC but the upstream peer is unresponsive, we must close the channel if we get too close to the HTLC timeout on their side.
Otherwise we risk an on-chain race condition between our HTLC success transaction and their HTLC timeout transaction, which could result in a loss of funds.

Add support for variable-length onion payloads at the Sphinx (cryptographic) layer.
This is currently unused as we keep using the legacy format by default (this will be changed in a later commit).
This commit also refactors quite heavily the Sphinx file.

We know can now do `goto(STATE) using DATA storing() sending msg1 msg2`.

* Use feeEstimator in NodeParams, remove all calls to Globals.feeratePerKw

* Introduce FeeConf object and config block for confirmation targets, remove unused 'smartfeeNBlocks'

* Use a custom confirmation target for commitment transaction

* Use a custom confirmation target for funding transaction

* Use custom confirmation target for mutual close transaction

* Use custom confirmation target for claim transactions

* Add confirmation target block 144

* Use block target = 12 as default for claim transactions

* Use correct cost comparison when evaluating if the amount we're sending is within the range htlcMinimumMsat/htlcMaximumMsat of the candidate channel