Separate save and delete button more widely

[schulmar]

When adding a new note, the save and delete button are right next to each other.

On small devices the user can click on delete accidentally which deletes the written text without any warning.

I propose to leave more space between the two buttons and to add a confirmation dialog to the delete button.

[maltefiala]

MyOwnNotes 2 is live. Complete rewrite, issue closed