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Support wasm tests on forks

Remove incorrect code in TimeoutPacket

Allow empty error receipt proof if sender is authorized

refactor: remove unnecessary decrement when fast forwarding upgrade sequence

Reorder call to application callback so it happens after we write state.

Proof in `MsgChannelUpgradeCancel` is allowed to be empty (gov override)

Emit an event when we move to `FLUSHCOMPLETE`

Remove setting counterparty upgrade info in upgrade try

Make sure that the error receipt we write always has a sequence greater than the existing one.

Change so that if the counterparty upgrade is found then we execute the code below

In `ChanUpgradeTry` it might be nice to add a note that we explicitly only set error receipts, the upgrade will not be aborted until it is proved to be incompatible in ChanUpgradeAck`.

Add comment to explain what the counterparty upgrade is used for.

`WriteUpgradeAckChannel` should have errors instead of just string (replace `fmt.Sprintf` with `fmt.Errorf`).

Add comment when setting the version to counterparty version

Add comment above or in the godoc (channel state is open, if chain executed init; or flushing, if it executed try).

Return in `MsgChannelUpgradeInitResponse` only the upgrade version and the upgrade sequence.

In `ChanUpgradeTry` move fast forward sequence down below after the call to `ChanUpgradeInit`.

Move events to message server layer instead of core level.

Remove setting counterparty upgrade info in upgrade try

Emit an event when we move to `FLUSHCOMPLETE`

Add comment about partially formed upgrade

Call WriteUpgradeOpenChannel before calling application callback

Make sure that the error receipt we write always has a sequence greater than the existing one.

Remove incorrect code in TimeoutPacket

Remove last packet sent from new upgrade constructor.

Remove `latestPacketSend` from `NewUpgrade` constructor

Pass the upgrade version returned by `OnChanUpgradeInit` to `WriteUpgradeInitChannel` instead of updating `upgrade.Fields.Version` in the message server.

Panic in `WriteErrorReceipt` instead of returning an error

Add comment in `ChanUpgradeInit` that a nil timeout is intentionally returned

Return correct error