This commit adds many traits, all named ‘Colours’, to the code. Each one asks for a colour needed to render a cell: the number of links asks for colours for the number and the multi-link-file special case; the file size asks for number, unit, punctuation, and device ID colours, or it can do a scale with its own colours, however it wants.
This is a step towards LS_COLORS compatibility, believe it or not. If a text cell in a column doesn’t depend on Colours to render itself, then the source of the colours is open-ended.
I am glad to have not needed any test changes here.
All four view types — lines, grid, details, and grid-details — held their own colours and classify flags.
This didn’t make any sense for the grid-details view, which had to pick which one to use: the values were in there twice.
It also gave the Table in the details view access to more information than it really should have had.
Now, those two flags are returned separately from the view “mode”, which is the new term for one of those four things.
