Make it easier to select one graph line from the CPU/memory chart

[ddennerline3]

Currently, it's not possible to quickly select one CPU or memory item in the Monitoring graph if there are a large number of workers. This makes it difficult to focus on just a few select workers - especially when there’s a large gap in memory and CPU scaling.
Can we change the graph selection behavior to match commonly used mouse clicking use cases.

• Support start/stop mouse range selection. Click the first item and then use shift-click for the end rage
• Change the default behavior to only select the current item under the cursor instead of just toggling
• Clicking the same item second time will restore the previous selections

[ludeknovy]

He @ddennerline3
I see your point, but am not sure how easy it is to implement it :|
The chart is handled by Highcharts, so if its not supported by it, it wont be possible.