Renamed SWID measurement endpoint

- Moved `/api/sessions/<pk>/swid_measurement` to `/api/sessions/<pk>/swid-measurement`
- Moved endpoint from core app to swid app
- Added optional format specifier to "add tags" endpoint
Added coveralls
Handle entities with multiple roles
Improved & tested enforcement save view
Added SQL_DEBUG setting

With SQL_DEBUG enabled, all executed SQL queries get printed to stdout.
Optimized database access in swid-measurement endpoint
Moved inventory und log view js files to swid app
Added sorting to reported by device table