Put each PID in its own .c file

src/main/flight/pid_betaflight.c

@@ -62,6 +62,9 @@ extern biquadFilter_t dtermFilterNotch[3];
 extern bool dtermNotchInitialised;
 extern bool dtermBiquadLpfInitialised;
 
+// PIDweight is a scale factor for PIDs which is derived from the throttle and TPA setting, and 100 = 100% scale means no PID reduction
+uint8_t PIDweight[3];
+
 void initFilters(const pidProfile_t *pidProfile);
 float getdT(void);