Feature: Utilize status LED for different BLE actions

[Nicell]

Most board replacements have a status LED on them that we can use to notify the user when the board is advertising, when it bonds, and when bonds are cleared. (switching profiles could be a feature in the future too). This would give much better feedback as to what's happening for troubleshooting and just in general.

[petejohanson]

As I was thinking about this, I thought about some states that would be helpful to indicate:

• No BLE connection
• New BLE connection
• Indicate clearing of all bonds via unpair combo.
• Active connection?

As we noted in Discord (https://discord.com/channels/719497620560543766/719544230497878116/746182170061570109), we might want to have those states be dependent on the selected "profile" or "slot" that is currently selected, to allow cycling between different paired devices, and pairing a new device into a certain slot.

Maybe another status might be:

• Blink # of times for that number slot you just switched to, then pause, then do the remaining status blink code?

[BrainWart]

Would this account for the peripheral pairing too?

[petejohanson]

(Previous deleted comment was based on me thinking this was a different issue. Oy.)

@BrainWart That's a good question. I think we'd use the peripheral LED for that status, so the central side status could be used for the connection status to the host. Seems that would work well.

[forrestbaer]

Perhaps it could be another & command for toggling, blinking, slow blink, fast blink, addressable?