Allow claims-like attribute keys

[wrabit]

Motivation

The current use of dictor to dynamically fetch attribute keys using pathsep='/' interferes with commonly used url-like claim names, i.e. http://schemas.xmlsoap.org/ws/2005/05/identity/claims/name

References:

• Slashes in SAML2 attribute names don't work #167

Bumping mr @mostafa as per Contribution notes ;)

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[wrabit]

One potential change for discussion is using something like '->' for the pathsep instead of '|' to reduce chances someone has it in existing attribute map keys.

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This PR was closed because it has been stalled for 10 days with no activity.