Threads tab: Change color of Park or Monitor

[cowwoc]

Version 1.4.1

I am not color blind and even I have no idea whether the threads I am looking at are currently parked or blocking on a monitor. The colors are extremely close to one another.

Please ensure that all colors in this graph are very far from each other. Making them color-blindness friendly would be even better.

[jisedlac]

Fixed in master. See GH-16.