Adds an operation to threshold the moving parts of an image

[JLLeitschuh]

No description provided.

[codecov-io]

Current coverage is 52.07%

Merging #560 into master will decrease coverage by -0.04% as of 57ce0e3

@@            master    #560   diff @@
======================================
  Files          154     155     +1
  Stmts         4578    4597    +19
  Branches       483     484     +1
  Methods          0       0       
======================================
+ Hit           2386    2394     +8
+ Partial        134     133     -1
- Missed        2058    2070    +12

Review entire Coverage Diff as of 57ce0e3

---

Uncovered Suggestions

1. +0.46% via .../ExceptionAlert.java#83...103
2. +0.33% via ...cketPreviewView.java#88...102
3. +0.33% via ...indowController.java#222...236
4. See 7 more...

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