Allow same prop replace syntax in props and ml-config

[grtjn]

In properties files you use ${app-name}, in ml-config you use @ml.app-name. The difference is confusing to my opinion. And not adding { } in ml-config makes people believe @ml.app-name-rest-modules is a full property name, where it actually is just a partial one (@ml.app-name + '-rest-modules').

I vote for adding different syntax to ml-config as well, preferably ${propname} like in properties themselves, alternatively @{ml.propname}. Thoughts?

[dmcassel]

It will have to be backwards-compatible, which means doing two passes. Not sure how many places that happens in the code. Hopefully only once, in which case, no big deal. It would be less confusing.

[grtjn]

Any particular reason to have the ml. prefix in ml-config?

[grtjn]

Fixed in dev