This allows you to be modify the tags from the NoteEditor. Related to
#114. We still need to add some way to filter the notes by tag. Also,
the current tag editor doesn't show the tags from the other notes.
The BottomAppBar when given in the Scaffold gets hidden when the
keyboard is visible. We had hacked around that by translating its
position, however that resulted in the cursor at the bottom being hidden
when we were typing a long note.
It is not just part of the body of the scaffold.
Also converted many functions into widgets.
This adds a '+' button to the NoteEditor which allows you to add an
image from either the Gallery or Take a photo. It then accordingly adds
updates markdown.
The file is added in the same directory as the note for now.
Related to #10
Fixes#58
I've tried adding a black space under the FAB, but that just reduces the
available vertical space while typing. This does reduce the usability
for small notes, as clicking on the FAB is much easier than clicking on
top-right back button or clicking the back button twice on Android.
