Support configuration of other runtime properties in ProcessorConfigDTO

[davetorok]

There are many properties in ProcessorConfigDTO that are useful to be able to specify, particularly as flows move from dev/staging/prod promotions.

concurrentlySchedulableTaskCount is one we particularly want to control.

[aperepel]

One thing to look out for is a deployment spec format change. Would now need to have a properties section (what is now called config) as well as the config, which is not supported currently, but houses system settings for the processor. This part is easy, in fact.

Will need to review and update all docs and utilities to account for this swap.