Purge options

The parameters are the following

- Purge Interval:Schedule when do you want to execute the purge
- Type of purge in database:Set how and what do you want to purge
- Purge by days
  - Delete database before (days):Will keep data of the last (XX) days and purge the rest
  - Delete files before (days):Will keep files of the last (XX) days and purge the rest
- Purge by Free Space
  - Delete files and database on SD below (percent):Will delete data in database and files stored until free space on the SD is lower than configured
  - Delete files and database on CAMERA below (percent):Will delete data in database and files stored until free space in the camera is lower than configured