* Safety Checks for UI, fix for cfg exceeding LED limit
* improvements to low heap check
* add `isPlaceholder()` to bus, some fixes
* remove `disableForceReconnect` for better future implementation
* add "glitch gating" for C3 and check heapy every 5 seconds instead of every secondd
* replace magic number with the correct define, more robust bus defer by look-ahead
In the event that a Bus fails to initialize, or the memory validation
fails, keep the configuration around so the settings contents don't
change out from under the user.
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Co-authored-by: Will Miles <will@willmiles.net>
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