minor sugg: colors: grid, tree items

[marcel]

Minor suggestion: to set colors of grid and also tree items in better detail.
It would be nice to be able

- to set up color of the grid lines
- - reason: when using not default colours, like white-on-black, the grid is too bright
- to set up tree items in better detail
- - reason:
- - - currently there are items
- - - - background - user defines - ok
- - - - selection background when the tree has focus - user defines - ok
- - - - selection background when the tree has NO focus - calculated by program - not nice
- - - - font - user defines - ok
- - - - selection font when the tree has focus - user defines - ok
- - - - selection font when the tree has NO focus - calculated by program - not nice
- - - - selection font with hovering with cursor above the items when the tree has focus - calculated by program - not nice
- - - - selection font with hovering with cursor above the items when the tree has NO focus - calculated by program - not nice
That means: some of the items can be defined by user, some are chosen by program.
It would be nicer to define all of them by user.

But it is minor wish.

Marcel