Mergin weather-qt and weather-cmd into one project

[hef]

I'm wondering if you thing this would be a good idea:

The idea is to first move weather-qt and weather-cmd into a common codebase, and then move the common functionality into a common space for both programs

[loansindi]

in principle, it shouldn't be that hard to kludge these two together. There's no good reason there couldn't be a command line flag --no-gui or something similar. It's been kicking around in the back of my head. I don't know what timeline makes the most sense for merging stuff together, whether it would be better to rip off the bandaid or wait a bit. I'm open to feedback.

[hef]

This actually keeps the 2 projects separate, but allows for code sharing between them.

I added a patch that seperates getReport() from the cmd version into a "weather-lib" , and refactors both weather-qt and weather-cmd to call getReport() from weather-lib

[hef]

QT Creator lets you switch between the 2 programs

[loansindi]

@jobybenoit do you wanna try out this PR and make sure both apps seems to function (though I expect weather-cmd will still crash at printing, i haven't investigated that yet)