Version endpoint RFC

This RFC should be the basis for discussing the version endpoint. See bug Bug xxxx

Actions and routes

The following table presents the current implementation, and the proposed changes.

Description	Action	Proposed path
Get version information	GET	/version

Object definition

{
    "version": "VERSION_NUMBER", // Full version string
    "major": "XX.YY", // Main version like 19.05, 20.11, ...
    "minor": "ZZ", // Monthly update of main version
    "db_revision": "123" // Database revision number
}