Allow applying unique colours to tree pane dependent on active file pane

[Free4all]

FC currently allows the user to specify a unique tree background colour when the associated file pane is focused (and thus the tree pane is not).

I would like to suggest that FC support the ability to assign unique colours to the tree pane's background and text (font) dependent on whether or not the associated file pane is active. Obviously, this will only be relevant when FC is configured for a tree being displayed per file pane.

This will help prevent user errors by making it more clear which tree is currently relevant (based on which file pane is active).

Also, adding support to assigning unique colour for the selected item based on the same criteria will be beneficial.

[Forez]

+1