Shift select

[maxkfranz]

Description of new feature

• Add a button that enters a mode where box select is enabled
• The icon should always be visible since it's really important, even if you have a small screen. It shouldn't go into the overflow/hamburger menu.
• Once you're in the mode, Cy API: disable user panning (drag automatically does box)
• Tooltip for the button must have a description to let users know about the key to do drag selection "normally" -- probably shift because it makes sense for Windows & Mac

Motivation for new feature

People can't find shift select

[chrtannus]

@maxkfranz Box-select does not work on touch devices, right? So should we just hide this icon if the screen is small?

[chrtannus]

Please let me know if you have a better idea for the icon and tooltip: