Standardize Variable*

[Affie]

WIP Notes:

• Consolidate VariableDFG and VariableCompute
• time stamps, see Change to VariableDFG.missionnanosec alongside .timestamp #1087
• smallData -> bloblets
• solverDataDict-> states
• dataDict -> blobentries
• nstime different uses:
  • as 0-999_999 nanosecond part of time stamp now in timestamp,
  • as steady timestamp now in steadytime
• see pr for some progress