Adding support for two new types to audit_change_type group

I would like to suggest to add the following codes to audit_change_type group:

• a "format conversion", "template reversioned" or “conversion” audit change type - when different versions of a specific composition will contain data based different versions of a template - see and https://discourse.openehr.org/t/upcoming-releases/3323/3?u=sebastian.iancu

• a “revert”, “restoration” or “restored” which is related to reverting a previously deleted content in