Add light/dark conditional to Xresources

[dgoodlad]

This is split from #49, and improved slightly.

[lkraav]

something seems to be wrong with this. doing set background in vim seems to be in exact reverse, light gives me dark background and vice versa. xterm itself behaves correctly.

[blueyed]

It is not working in Vim for me correctly, too.

Is this related to this comment/missing fix? #49 (comment)

My whole ~/.Xdefaults file is available here: http://pastebin.com/raw.php?i=kZiuEwRb

[lkraav]

regarding #140, i've discovered taht flipping #defines is not enough, you also need to flip color definitions for xresources light to work properly. otherwise for example vim (and probably others) will for example think that you always have dark background color.

lkraav/dotfiles@2b0b536

not sure if altercation has any time for this project anymore. would love to hear from other solarized xresources users. imho solarized light combined with xcalib -invert for night time is the best combo there is.

one thing i dont understand regarding this is altercation's comment #49 (comment). why would light mode foreground color have to be flipped? if i flip both *foreground and *background after flipping #defines, it will just revert back to dark mode.

[TrevorBramble]

We have an experimental dynamic loading method that doesn't seem to awkward or fragile. But for now flip-flopping dark/light can be done by swapping commented sections.