Plot Cursor default Color "gray" is hardly visible change it to e.g "green" or make color optional

[DFKChris]

Feature-request:
Change the default Signal-plot cursor color from grey to e.g "green" or make it changeable!

When working with Signal-plots you lose very fast the overview where you are currently located especially if you have multiple plot windows open. Due to image size restriction of <10kb I can only upload a very small example:

The current cursor is grey as well as the background and the helper lines. This makes it very hard to locate. If we hover into the plot and into a specific data point the hover line is yellow which makes the "hover" line much more visible.

--> I propose to just change the default grey line to a more visible color like e.g "green"

[carolinabamorim]

Hi @DFKChris we will take this into consideration, but not high prio. If you are able to open a PR with this change please feel free to do so :) thank you!