[WIP]: per sensor instance user configurable priority (replaces uORB priority)

[dagar]

This pull request introduces a configurable priority parameter per sensor instance. It replaces both the existing CAL_{ACC,GYRO,MAG}x_EN parameters and the uORB priority mechanism.

• new priority parameters CAL_ACCx_PRIO, CAL_GYROx_PRIO, CAL_MAGx_PRIO

 * @value 0   Disabled
 * @value 1   Min
 * @value 25  Very Low
 * @value 50  Low
 * @value 75  Default
 * @value 100 High
 * @value 125 Very High
 * @value 255 Max

• CAL_ACC_PRIME, CAL_GYRO_PRIME, CAL_MAG_PRIME deleted (these have occasionally caused confusion)
• TODO: special cases like external mags can be set to a higher priority by default, otherwise initial sensor priority is startup order
• TODO: add baro cal for priority configuration
• TODO: migrate CAL_ACCx_EN/CAL_GYROx_EN/CAL_MAGx_EN
• closes per sensor configurable priority  #14948

I'll come back to this post v1.11 release.

[dagar]

@julianoes, @bkueng, @RomanBapst - No rush, but I'd like to get your feedback on this idea before I go further.

[dagar]

We could also consider configuring the order more explicitly rather than a somewhat vague priority.

[RomanBapst]

@dagar Thanks for the quick follow up. This is exactly what I imagined. Let's continue after the release then.

[dagar]

We could also consider configuring the order more explicitly rather than a somewhat vague priority.

This might be more awkward dealing with conflicts or gaps. I'll stick with the priority levels.

[dagar]

This has been rolled into #15235 because it was already addressing some of the missing pieces.