* adding one point to whitelist contract constraints migration - signed CorDapp JAR must be registered with the CZ network operator
* 1. Removing later releases section
2. Changing 4.0 to 4.3
* Changing 4.3 to |corda_version|
If a single whitelisted constraint is being used by input states and the version of the cordapp changes + is signed, then the constraint will transition to a signature constraint.
* Added new guide on CorDapp Constraints Migration procedures.
* Apply formatting and upper/lowercase changes.
* Updated following PR review feedback from RGB and MH.
* Minor clarification and cleanup.
* Clarify step to ensure there is only one version ("signed") of the same Contracts CorDapp in the nodes /cordapp folder
* Incorporating feedback from SS.
* Replaced "propagate" with "transition".
Adjust terminology to be consistent.
* Removed confusing statement.
