fix: revert logging warnings

[DSCaskey]

This reverts some of the warning() logging messages back to debug() messages so that a warning dialog does not pop up. In these cases it's perfectly acceptable to only report the debug() messages while running in debug mode.

Fixes issue #1028

[what-the-diff]

PR Summary 🚀

Hello wonderful team! 😊 Here are the marvellous changes we have made to the code base:

• Change of Statements in Multiple Files 😇
  In files like dialoghistory.cpp, groups_widget.cpp, mainwindow.cpp, and vabstractpattern.cpp, we've made the code a little more friendly for our developers. We have switched qWarning() statements to qDebug() statements. 🔄 This is fantastic for us, as it makes debugging easier, leading to a more efficient troubleshooting, and subsequently, a smoother software. 😉

• Syntax Update in 'mainwindowsnogui.cpp' 📘
  We've given mainwindowsnogui.cpp a nice little readability boost by replacing 'not' keyword with '!'. Instances include changing expressions such as if (not dir.exists(path)) to if (!dir.exists(path)) and similar. This modernizes our syntax, makes our code more readable and thus helps us maintain the high quality of our software! 🌟

• Another Statement Switch in 'fvupdater.cpp' 🔄
  Again, for the sake of simplifying and improving our debugging process, the qWarning() statement in fvupdater.cpp has been changed to qDebug(). More simplicity, less nuisances. 😌

Awesome job everyone! Let's keep smashing it and creating a more friendly environment for both our developers and our users. 👏💪 Let's do this! 🌈🚀

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[csett86]

Looks good to me

[DSCaskey]

@csett86

Thanks. I figured I'd have you review it... I think Susan's busy lately. I'll merge it as soon as the checks complete.