Change the default background to something darker about improviz

[rumblesan]

hey, so this totally makes sense, and in theory should be pretty easy to sort, but there's a bit of a problem at the moment.
I upgraded my mac to the latest OS, forgetting that apple removed OpenGL from it, and I'm now no longer able to build improviz... which is kind of a major issue :(

I'm gradually working on some possible fixes, but yeah it's not an ideal situation. will keep you in the loop though

[sorenpeter]

Hi, Damn yeah that sucks. What about installing linux?

[rumblesan]

It's definitely on the cards, though I still won't be able to create the prebuilt versions for osx. For the last release I had to create those manually, and I've realised now it's because all the osx virtual machines that the CI services use have upgraded to more recent versions and so don't have opengl either hah