Design work on collapser and cells for the beta

[ellisonbg]

• Removes some stale styling of collapser
• Styles collapser in console
• Fixed console styles
• Minor design updates to new cell view

[ellisonbg]

Looks like there is still a rendering problem with the collapser on firefox latest. Working on that now...

[ellisonbg]

OK, talked with @blink1073 and @afshin:

• Moved away from changing the width of the collapser on hover, was too flickery. Now using a more traditional mostly flat button design (see screenshots below).
• Narrowed width of collapser to 8px, using minor box shadow and color change on hover.
• Using simpler console design.
• Also starting to use 2px border radius on buttons.

This is ready for review.

Dark theme, active, but not hovered:

Dark theme, active, input collapser hovered to show minor drop shadow and color change:

Light theme, active, but not hovered:

Light theme, active, input collapser hovered to show minor drop shadow and color change:

[ellisonbg]

And here is the console design:

Dark theme:

[blink1073]

Thanks!