a few moderate changes

a few moderate changes

Features:
 * Support version string emission, once per hour to
   esp32/sensor_version
 * Set every PWM LED GPIO invididually if it's != -1 (now supports all 6
   channels)

Bugfix:
 * Never sleep negative time if you waited too long already (which since
   it's a uint I think just becomes very positive and sleeps almost
   forever)

Ehh:
 * Some attempted changes around repolling and rechecking motion
   settings
 * Pull-down back to enabled because we're using the big PIR sensors
 * Hysteresis enabled to prevent spamming of the channel