[NIFI-1782] update toolbox, new global menu, and new pallattes

[scottyaslan]

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[mcgilman]

Hey @scottyaslan this is a great start. I have a couple comments that I think we need to address before we merge this in and then I have additional feedback that I think needs to be included in the next Global Menu/Flow Status PR which will include the remainder of functionality in the mock up in NIFI-1323.

For this PR

• The birdseye view does not render the processor or processGroup preview. It appears the position is not being accessed correctly.
• Can we move flowfont files into a separate directory under font (next to the Roboto directories)? Since flowfont.css came with flowfont can we please co-locate these? We'll also need to identify which images in this bundle were not produced by us and ensure we're updating license/notice accordingly.

For the next PR

• When dragging a component onto the canvas, the source icon leaves the toolbox when dragged. This icon should remain in the toolbox while a different icon should follow the cursor onto the canvas. Maybe we should update the original icon with something that suggests it's draggable while the dragged icon indicates that a new component is being added. Specifically, I'm thinking of our New Connection icon which shows a Connection arrow with a '+'.
• The global menu button appears to shift upwards a couple pixels when clicked. I don't think this button should move. Additionally, the button and the menu are too disjoint especially while closing. They transition with different effects and at different rates.
• The logged in user name wraps onto the following line where the Log Out link would be.

[scottyaslan]

Thanks @mcgilman! I have made some updates:

• The issue with the birdseye view has been resolve.
• The flowfont and font-awesome files have been separated. (NOTE: As part of this effort I introduced the frontend-maven-plugin)
• When dragging a component onto the canvas the source icon now stays in the toolbox.
• The global menu button no longer shifts upwards.
• The logged in user name no longer wraps and displays ellipsis if too long.

[mcgilman]

Looks great. The update to the global menu addresses my concerns that I was hoping we could address in the next PR. I've merged this into master.

Thanks!