Mobile push notification content

[Just-Insane]

Description

Adds toggle-able message body to notifications (both un-encrypted and encrypted get toggles) with a note that encrypted body may not work in some instances, due to platform limitations.

Fixes #61

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings