[CMake] Carriage returns in CMake GUI + Stopping execute_process()

[Person Withhats]

2 questions:
1) I'm printing download progress via carrige returns, but the CMake GUI
does it like this. Anyway to get output to work properly?
21561344 [2.77%]

21626880 [2.77%]

21692416 [2.78%]

21757952 [2.79%]

21823488 [2.80%]

21889024 [2.81%]

21954560 [2.82%]

22020096 [2.82%]

22085632 [2.83%]

22151168 [2.84%]

2) Pressing 'Stop' does not halt processes spun up by execute_process,
CMake waits until they finish before exiting.....very aggrevating!
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