Prop 100: Setup Acrechain IBC Auto-Forwarding

This proposal, if accepted, would establish the bech32 address prefix 'acre' as the IBC Auto-Forwarding prefix for SendToCosmos transactions. Any SendToCosmos transactions whose CosmosReceiver field begins with 'acre1' would automatically be forwarded to Acrechain over IBC channel channel-106. Failed IBC transactions will result in tokens transferred to the equivalent address on the Gravity Bridge chain, requiring user intervention with the same Ethermint private key after the Polaris upgrade completes. When evaluating this proposal the community should be confident that channel-106 is the official channel leading to Acrechain, and that is the correct prefix for Acrechain account addresses. For more about Acrechain see https://arable.finance/ and https://twitter.com/ArableProtocol