Clarify definition(s) of "value token" #22
Description
"Value token", while conceptually consistent, has different specific meanings in different code contexts (e.g., BrandedToken vs EIP20Gateway), but the context-specific meanings may not be clear or consistently applied in those different contexts.
The different meanings in the OpenST repos (mosaic-contracts, brandedtoken-contracts, etc.), both documented and implemented, should be clarified and aligned in a terminology document in this repo (add the document if it does not exist; update readme to point to the document if the readme does not already do so). This ticket does not include making alignment/clarity/consistency in the other repos—any such need should be specified in other tickets.