Reduced the size of averaging buffer and introduced a raw (unfiltered) value. Averaged value is same as before, but one byte saved per class instance. Unfiltered value is used for writing into telemetry log.
Removed test code
Merge branch 'next-upstream'
Merge pull request #1413 from opentx/projectkk2glider/telemetry_enhancements

Unfiltered value used for writing into telemetry log