Add throttle limit settings to CMS

There have been a number of requests for this as it seems to be common for racers to tune these values and adjust the settings as they become more comfortable with a track. Previously the settings could only be adjusted in the CLI and required a computer. Adding them to the CMS makes it easy to adjust in the field.

src/main/fc/controlrate_profile.h

@@ -35,6 +35,7 @@ typedef enum {
     THROTTLE_LIMIT_TYPE_OFF = 0,
     THROTTLE_LIMIT_TYPE_SCALE,
     THROTTLE_LIMIT_TYPE_CLIP,
+    THROTTLE_LIMIT_TYPE_COUNT   // must be the last entry
 } throttleLimitType_e;