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deefa3a9f1
This adds the ContextGuard struct from the taproot-assets repository that has been in use there for a while. The context guard allows for easy creation of contexts that depend on a central wait group and quit channel. A context can either be created with a timeout and quit, meaning it will cancel either on reaching the timeout or when the central quit channel is closed. Or a context can be created to block and use a timeout, meaning it will _not_ cancel on quit but rather block the shutdown until it is completed (or times out). The third way is to create a context that just cancels on quit with no timeout.