Improve entry group management

[alexbakker]

Support for entry groups is fairly basic currently.

• Create a separate DatabaseEntryGroup object for groups
  • Fields: UUID, Name
• DatabaseEntry
  • Refer to groups by their UUID instead of their Name
  • Allow assigning an entry to multiple groups
• EditEntryActivity
  • Allow assigning an entry to multiple groups
• GroupManagerActivity
  • Require the user to click a "Save" button before actually saving any changes
  • Warn about unsaved changes by showing a "Discard changes?" dialog
  • Add the ability to rename groups
• MainActivity
  • Support selecting multiple groups to filter on
  • Persist the selected group filter

[rmunozrodriguez]

Persist the selected group filter on exit would be great.

[claytondaley]

I'd really like a top-level groups UI element (i.e. two clicks to pick a group vs 3) to complement the "persist group" suggestion above. I went back to "Authenticator Plus" to see how they do it (atrocious security but I needed groups badly) and I also feel like their menu icon is less fiddly which seems to be due to (1) ~2x the real estate and (2) on the left. I find the smaller icon jammed up against the right edge (i.e. the lip of my case) a lot harder to use.

[OmlineEditor]

• Allow assigning an entry to multiple groups

in the drop-down list add a box for selection.

[InfiniteCoder06]

@alexbakker I would be happy to help into this issue

Create a separate DatabaseEntryGroup object for groups

• Fields: UUID, Name

It looks like this has been implemented right?

Currently working on Renaming of groups

[alexbakker]

It looks like this has been implemented right?

Indeed, I've updated the task list.

[InfiniteCoder06]

@alexbakker Whenever free please do review my PR's

[alexbakker]

Now that #1349 is merged, the checklist is complete. Thanks to everyone who contributed to make this happen!