user configurable sample rate, true peak detection

1. User can set sampling rate to suit expected range of frequencies:
- HIGH suits 4" or smaller and 6S 5"
- MEDIUM suits classic 5" 4S
- LOW is for 6" or greater
Limits automatically scaled:
HIGH : 133/166 to 1000Hz, MEDIUM : 89/111 to 666Hz, LOW : 67/83 to 500Hz
2. Bandpass entirely eliminated, not needed.
3. True peak detection method, favouring first peak to exceed 80% of maximum bin height; ignore or threshold values not required.

src/main/interface/settings.h

@@ -114,6 +114,7 @@ typedef enum {
 #endif // USE_RC_SMOOTHING_FILTER
 #ifdef USE_GYRO_DATA_ANALYSE
     TABLE_DYNAMIC_FFT_LOCATION,
+    TABLE_DYNAMIC_FILTER_RANGE,
 #endif // USE_GYRO_DATA_ANALYSE
 
     LOOKUP_TABLE_COUNT