Create a toggle preset component

[legaard]

Implementation steps:

• Create a new component (e.g. TogglePresetComponent) and add it to the sidebar
  • Should have some kind of button and input field
  • Emit name of preset when clicked
• The sidebar component should act on "create preset events", i.e. take emitted name of preset, find all active (student toggled on) students' IDs an dispatch a "add preset" action