[68] Add support for labels

[maelchiotti]

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[maelchiotti]

@victorbnl The labels should be fully functional! They are on by default, but can be disabled in the settings. You can find the APK on the latest deployment (open the latest one and find the artifact at the bottom of the page).

You can manage them from the navigation drawer, they have their own page. A label has a name and a color. You can pin them (they will be shown first everywhere) and hide them (they will be hidden everywhere except in the management page).

The list of labels is displayed on the notes tiles and at the bottom of the editor. Both can be disabled in the settings.

In the editor, you can select the labels of the note by clicking on the labels list of by using the context menu.

Feel free to give me any feedback! And of course make sure you exports your notes as JSON first, and make sure the export works correctly.