Background colour styling for stubs

[HansMellman]

Currently using a function to map colours to cells based on their content - with the tab_options as they stand I'm unable to use the function to colour the stub_background_colour as it expects a string - I know this is likely to be addressed in the implementation of the full loc Objects - just wanted to present another use case where this would be beneficial.

Example 1 pre stub creation

example 2 post stub creation

If this is already possible in some other way and I'm unaware please feel free to correct, cheers!