Add multi-state buttons (more than 2 states)

[charlestytler]

Verified that the Streamdeck SDK can support more than 2 states, only the built-in GUI is limited to two states for setting icons.
Add a multiple-states button that could handle 3-way switches, rotaries with unique images for each position, etc.

• Expand ImageStateMonitor to handle an arbitrary number of states instead of 2
• Create new popout window in button property inspector that allows uploading multiple icon images and conditions
• Add functions to send images to Streamdeck states
• Add a multi-state switch
• Add a multi-state increment

[charlestytler]

Possible way of implementing user settings

[gordonkatt]

This would be so cool :)

[inexus888]

I would love to see this supported. If not dynamic three states would be great as we often see switches with three states in the aircrafts. I reckon It's rare to see more than three states I reckon unless it's something like a dial or similar.