* separate our styling from a libraries included .css
* update npm packages: bluebird, inflection, jbox, jquery, jquery-ui-npm
* ports and osd tabs needed small javascript changes for the above
* refactored CSS style sheets, in summary Cascading was being ignored
* tweaked colors in dark mode.
* tweaked betaflight logo for dark mode care of frozenskys
* dark mode can also trigger on `(prefers-color-scheme: dark)` signal from the OS when NW.js 0.40.0/Chrome 76 is released.
* changed how `gulp-appdmg` is brought in, mixing yarn and npm was causing trouble
* version.json is now written in a more gulpful manner
Note: this works fine with NW.js 0.40.0-beta1
