Conditional support for replace1/replace2 templates

[roleyfoley]

Expected Behaviour

When developing components it is possible to specify which resources trigger the use of the replace templates if they have been flagged for replacement

Current Behaviour

If any resource is marked for replacement template is run, this can create unexpected changes to the more complex resources which require replace handling. I.e. alarms being replaced as part of a DB instance.

Possible Solution

This really requires more complex definition of deployments and would require the engine to generate a contract outlining how to run the deployment as the engine handles defining and managing resources.

Context

this would make replace template usage safer and more easily understood