Scoring calculation / Calculated fields part II

Proposal one-liner:
The second chunk of the work on scoring calculation (which was NOT initially approved through the DAO). This is about making calculations from the previously approved proposal more generally available throughout the system. A developer can now configure the calculated fields in a form. This work has been exceptionally approved and is now completed and ready for testing/merging ($5k)

Value proposition:
Now all Primero implementations and users can benefit from having scoring calculations / calculated fields in forms and subforms.

Brief explanation
A developer can now configure the calculated fields in a form.
Acceptance criteria
Multiple fields can now properly derive and represent a calculated value. This can be configured by a developer.
Time estimation
This was estimated at 2 weeks, but it is completed. ($5k)
Risk estimation
Low
Proposal Stakeholders
All users

This proposal was approved on 25 October by the voting members. Payment will be processed.