Added MenuBar action Project->New, which opens a directory dialog for choosing the new source directory to parse the
files from. The ConfigManager can be created empty now and setValue calls can be used to set values.
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This change refactors parts of the QtCodeSnippet and places some settings into ApplicationSettings.
Additionally Application- and ProjectSettings were abstracted to the common base class Settings, which takes care of the
getting and setting values of the Configmanager member.