Added the averaged initial average as well as problem key rejection

Added the averaged initial average as well as problem key rejection

- Any keys that exceed the high average are temporarily disabled
- If the sense value goes below the initial average sense, it is re-enabled
- Even works if *many* keys are pressed initially

- Still needs a bit of detection of consistent high keys that sometimes sneak below the threshold
  (May be able to have an elastic threshold that could deal with this)

- Removed dead code (and redundant calculations)