Variables in civicrm_setting should have their own namespace

[alexymik]

Currently the variables for Summary Fields are stored in the civicrm_setting table using their "local" names:

• generate_schema_and_data
• event_type_ids

I would suggest to namespace these to something like sumfields_, ex:

• sumfields_generate_schema_and_data
• sumfields_event_type_ids

This would make it more clear what the variables are when viewed outside the Summary Field context.

sumfields_get_setting() could be modified to directly use this as a prefix so most of the code can remain the same.

[jmcclelland]

Yes - that is a good idea. Would you be up for a PR? I think it would also need an upgrade step to rename the existing settings.