Fix Mojave compatibility

Changes the Xcode build settings to enable compatibility with Mojave.

The change consisted of adding the module name to the NSPrincipalClass value in the Info.plist file. We went from Main to literary_screensaver.Main.

Support for different screen resolutions

Thanks to @keithamoss, the screensaver now adapts to different screen sizes!

Dark mode!

A dark mode has been added and is now set as the default theme 🕶. Several quotes with obscene language have also been removed from this release.

The theme is not yet customisable without re-compiling the code, so please download the previous 0.2-beta if you're after a daylight experience. Otherwise, enjoy!

Beta

Woot! The screensaver is now in a semi-usable state with the addition of styling for the time within the quote!

There's still plenty of work to be done - namely around displaying a quote that's close to the current time, if none of them match exactly, and accounting for different screen resolutions.

Early release

This is an early preview of the screensaver for people who are keen to try it out as I'm developing it.

It does the basics but it's a bit rough around the edges. The main issue to be solved is styling the temporal portion of the quote differently; currently it's difficult to tell which part of the quote refers to the time. The problem is exacerbated when a quote features multiple times, as you can imagine.