Upgrade wasmvm to 0.15.0

[webmaster128]

Not yet released. Will follow shortly after https://github.com/CosmWasm/cosmwasm/milestone/17 is done.

[webmaster128]

v0.15.0-rc1 is available for integration. The changes can be seen here: CosmWasm/wasmvm#225

[webmaster128]

wasmvm 0.15.0 is released. The full diff containing the Go changes is here: CosmWasm/wasmvm@v0.14.0...v0.15.0

Some notes on the update:

• Messages and submessages are merged; the replyOn type now got a new "never" case for the fire and forget messages
• replyOn is not an integer but supports the Stringer interface (i.e. .String())
• The interface version was bumped from interface_version_5 to interface_version_6 such that CosmWasm 0.15.0 contracts need to be used
• In some Wasm messages "send" was renamed to "funds" for consistency
• The IBC acknowledgement type was changed slightly
• There is a new Gov message (MsgVote) that needs to be connected
• Deserializing contract results now cost gas. This needs to be configured in a new argument of vm.Execute and friends. We messed up storing the value in the vm instance, such that it needs to be passed to every call. Sorry for that! The deserialization cost is in gas per byte. It is a fraction, so you can use 20/1, 10/1, 1/1, 1/2, 1/30, ... in there.
• Contract responses now contain events. The exiting Attributes should go into a main wasm event as before. All other events should be added with a wasm- prefix on the event type.