Allow forced_transfer to be set on existing markers using governance

[iramiller]

Summary

Add the ability for a governance proposal to be submitted which can change the forced_transfer setting on an existing RESTRICTED marker.

Problem Definition

The forced transfer capability is a new feature which allows markers to be created with a transfer agent that has complete control of the token movement regardless of where it is stored. As this setting breaks the rules of an account requiring its signature before moving funds this option can only be set when a marker is initially created so users acquiring the token can be aware of the terms of its possession.

This request would add the ability for a marker that allows governance control and is set to RESTRICTED to have the forced_transfer flag changed when a governance proposal request is passed.

Proposal

Create a new msg that can be dispatched by the governance module (signed by the governance module as the authority) which allows the forced_update setting on an existing marker to be changed. This request should only be allowed for RESTRICTED markers that have allow_governance control enabled.

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