Support for mobile devices

[ishubin]

• [x] touch events in svg editor
• [x] adjust size of various controls for mobile devices:
  • [x] item tooltip
  • [x] dropdowns (should be scrollable if they don't fit the screen, e.g. dropdown menu in quick helper panel)
  • [x] tabs
• [x] screen dragging in edit mode
• [x] screen dragging inertia in view mode
• [x] modals should not have height greater than screen height
• [x] ping to zoom
• [x] Remove header in mobile, to give more vertical space to the svg player/editor
• [x] home/folder view
• [ ] standalone player should work the same as the normal player in mobile
• [x] in place text editor
• [x] all control points in edit box should be bigger in mobile devices