[Feature] Encrypt file names and album names

[timkrief]

Is your feature request related to a problem? Please describe.
File names and folder/album names are in plain text in database and backup.

Describe the solution you'd like
Encrypt this information in database and backup.

Describe alternatives you've considered
Option to randomize file names at import?

[timkrief]

If one want to encrypt only the meta.json they have to rezip the entire backup which can be really long. Would it be possible to have the backup not zipped? (it could even open the door to iterative backups) The restore could be the same with an extra step from the user side to zip everything on their own (or even accept a non zipped folder as possible restore option).

[timkrief]

Plus a non zipped backup could allow people with OTG fat32 USB stick to backup more than 4Go of total data.