Start-app todo

[dy]

• [x] label property
• [x] help property (value of range etc.)
• [x] button type - to react on event
• [x] range type with 2 values (actual range)
• [x] range type with fixed choices (fftSize for example)
• [x] nested params, like type enables width etc.
• [x] a separate module
• [x] reload required

[dy]

Nested params done via change callback - just hide/show needed as setParam(name, {hidden: true})

[dy]

Reload required is set through help text