logic: refactored QtProjectWizzard to remove duplicate definition of contents shown for setup and summary

* also added current page count (e.g. 1/3) to project setup
* moved the code for copying a source group to the settings classes so that the wizzard doesn't need to know which source groups may be there anymore.

src/lib/settings/SourceGroupSettingsJavaEmpty.h

@@ -13,6 +13,8 @@ class SourceGroupSettingsJavaEmpty
 public:
 	SourceGroupSettingsJavaEmpty(const std::string& id, const ProjectSettings* projectSettings);
 
+	std::shared_ptr<SourceGroupSettings> createCopy() const override;
+
 	void load(std::shared_ptr<const ConfigManager> config) override;
 	void save(std::shared_ptr<ConfigManager> config) override;