SOLIDPOD: Implement optional non encrypt on SolidLogin

Depends

• https://github.com/anusii/solidpod/issues/77
• https://github.com/anusii/solidpod/issues/78

Description

Encryption is on by default for the data stored in our app pod, but is optional either globally or per read/write.

Closing Criteria

• SolidLogin() has a new paramater encrypted: True as the default
• SolidLoginPopup() has a new paramater encrypted: True as the default
• If encrypted: False in the Logins then do not ask for a password and not not allow readPod/writePod to set encrypted: True
• readPod() and writePod() will decrypt/encrypt under the bonnet if encryption is enabled.
• readPod() and writePod() take an optional argument to override global default encrypted: False for example.
• enableEncryption() can be used later to prompt for Password and enable read/write of encryption