Adopt new package structure of ProtoData

[alexander-yevsyukov]

This PR migrates to latest version of ProtoData (0.61.1), adopting the new package structure.

Other notable changes

• The general purpose rendering classes that were recently copied to ProtoData were removed.
• The RejectionThrowableConvention was copied from ProtoData.
• Added backward compatibility code with current version of Validation (until the coupling issue is addressed).