Tool Labels: Add, Edit, Delete

[PaulHax]

Adds edit label and add label buttons to label list card:

Clicking the pencil button pops a modal:

closes #347

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[floryst]

Some UI suggestions:

• I think the edit button background doesn't look great given that it intersects with the label border. Lets try either removing the button background altogether or introduce a small gap between the button and the label border.
• I think we should have a "save/done" button in the label editor, even though all changes persist immediately. Not all users will understand that changes are auto-saved. Side-note: we may need to add a "cancel" button if users would rather changes not persist immediately, but I don't think we should handle that case right now.
• I think we may re-examine the layout of the label editor down the road. I like how it is currently because it allows for more fields in the future, but something still feels off. Maybe it's the lack of margins around the color picker and the text editor.

[PaulHax]

Some UI suggestions:

Good tips. I removed the outline on the edit label button, added a "close" button, and introduced some white space to edit label module.

[floryst]

LGTM!