Miscellaneous updates: CoilPlayer, Bonus, BCP Service

[avanwinkle]

This PR presents a handful of changes I've been carrying around in my local branch and never got around to merging. It's my last PR for the week, I promise! 😝

• CoilPlayer now supports placeholders in the keys, so shows can use tokens to target coils. Very useful for adding flashers to shows.
• Bonus Mode gets a new option skip_if_negative so that bonus calculations less than zero will be ignored, rather than subtracting from the player's score
• BCP Clients can subscribe to service mode events as a group, instead of needing to get them all individually
• Switch Diagnostics in the service menu will gracefully handle switches without labels (currently displays %)
• Fast Drivers have fallbacks for hold_pwm_patter and recycle_ms not being present in the config

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!

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