Tool icons on the top-right

[maxkfranz]

Description of new feature

• [x] Two icons should always be visible: shift/box select and download. The rest can just go in the hamburger menu all the time.
• [ ] New list of icons / tools in the hamburger:
  • [x] Undo
  • [x] Delete -- removed (also see #262)
  • [x] Restore
  • [x] Zoom in
  • [x] Zoom out
  • [x] Fit
  • [x] Shift-Select (see #265)
  • [x] Download -- moved outside
  • [ ] Share by email: Open email dialog (related to #261)
• [x] Download icon should be a line with an arrow
• [x] Same icon for download gene list
• [x] It needs to be clear in the tooltip for the main download what you get: Download
• [x] The one download option downloads everything -- the enrichment files and the images in one ZIP

Motivation for new feature

• There are a lot of icons, and it's difficult to find the important ones, like download.

[chrtannus]

This is how the toolbar looks now when shift-select and download are visible but the other ones are in the overflow menu:

(*) Notice that I'm suggesting we use the more standard vertical ellipsis icon in this scenario, instead of the hamburger one, which is more associated with a mobile device's menu and usually contains all the other menu/toolbar options. I just find that the hamburger icon would not stand out as much here.

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This is how it look on small screens (mobile):

(*) I suggest we hide all the toolbar icons in this scenario--the screen is just too small--and that we use the hamburger icon.

[chrtannus]

The mobile/overflow menu now renders toggleable items properly:

[mikekucera]

looks good

[chrtannus]