Process widget data in background when widgets are closed

[retiutut]

Networking Outputs, and those that need data processed in the background:

• Time Series filtered - Done
• Time Series unfiltered - Done
• Focus - NEED
• FFT - Done
• EMG - Done
• AvgBandPower - NEED
• BandPower - Done
• Accelerometer - NEED
• Digital Read - NEED
• Analog Read - NEED
• Pulse - NEED
• EMG Joystick - NEED
• Marker - Done
• Process sampling rate dependent data accumulation in background when Networking widget is closed

[philippitts]

Tested and confirmed the changes are working as expected 👍

[philippitts]

I recommend checking the debug flag before entering the debug method, rather than after. The function name should be something of a contract to the developer. If it says it will do something, it should do it. In this case, the function name is debugTimeSeriesDataSamplingRate but in truth it's more like debugTimeSeriesDataSamplingRateIfDebugFlagIsSet as implemented. That could be confusing to a future developer who calls that function, but doesn't set the flag. Setting the flag outside the function avoids that confusion.

Everything else looks good - no need to re-request a review after fixing the above. I'll approve now and you can go ahead and merge after.

[retiutut]

Closes #1094