update offers a dark mode compatible collection of Gdk background overrides

[csylvain]

built pihpsdr and found all the menus were white text on white background.
created a Makefile option to use new file bkgnd.h which contains a background color definition which is not 'white'.
changed all the menu code to use the new option when enabled.
note: the discovery menu is unique in that it is similar but not exactly the same override variable as all the others.
also see #28

[petrus-lt]

I didn't tried this change but @markusgrosser one from #28, which works fine if you adapt it to current code (see my non-white-menu branch).
Two things I see with your diff:

• you also hardcode background colors, so now we have two options instead of one. Can't this be handled by the WM instead, like in @markusgrosser PR?
• you added main.c with your custom resolution (1366x768) in the diff, this should be removed.

But without a change like this, pihpsdr is pretty unusable for me, so I'd welcome such a change.

[dl1ycf]

The dl1ycf version is now fully compatible with both white and dark mode, and does minimal fiddling around
and leaves nearly everything to GTK.

[petrus-lt]

@dl1ycf Thanks, indeed. I found your fork afterwards. I'm using it now.

[csylvain]

i meant to mention the DL1YCF fork cured all the various hard-coded GTK stuff making PiHPSDR fully usable without regard to a user's theme choice. glad to see you found your way to it, despite my inattention to this issue!

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