Add hierarchical environment variables #162
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Motivation:
As in #135 that introduced hierarchical system properties, the motivation here is to implement hierarchical environment variables separated by dots. This allows environment variables to be converted into JSON objects.
Conformance:
Your commits should be signed and you should have signed the Eclipse Contributor Agreement as explained in https://github.com/eclipse/vert.x/blob/master/CONTRIBUTING.md
Please also make sure you adhere to the code style guidelines: https://github.com/vert-x3/wiki/wiki/Vert.x-code-style-guidelines