Support mapping colons to double underscores in environment variables.
The : separator doesn't work with environment variable hierarchical keys on all platforms. , the double underscore, is supported on all platforms. This PR allows configuring the environment config builder to replace the : in environment variable names with
172 introduced a more flexible and generic way to handle character mapping across the board for config builders. You should be able to leverage the 'charMap' attribute to do this in the next release.
Support mapping colons to double underscores in environment variables.
Addresses #123