logic: source groups for project settings

* project can not have multiple source groups with different types
* language of a project is now inferred from source groups
* setting global NameHierarchy delimiter of first sourceGroup in project
* added project settings migrations for source groups
* Add Settings Migration classes (MoveKey, DeleteKey, Lambda)
* Update sample projects with migrations
* added method to config to retrieve sublevel key names
* implemented recursive removing of keys in settings
* moved project files out of top level
* removed solution parsing code as it is not used anymore

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src/lib/settings/SourceGroupSettingsJava.h

@@ -0,0 +1,45 @@
+#ifndef SOURCE_GROUP_SETTINGS_JAVA_H
+#define SOURCE_GROUP_SETTINGS_JAVA_H
+
+#include <memory>
+#include <vector>
+
+#include "settings/SourceGroupSettings.h"
+
+class SourceGroupSettingsJava
+	: public SourceGroupSettings
+{
+public:
+	SourceGroupSettingsJava(const std::string& id, SourceGroupType type, const ProjectSettings* projectSettings);
+	virtual ~SourceGroupSettingsJava();
+
+	virtual bool equals(std::shared_ptr<SourceGroupSettings> other) const;
+
+	virtual std::vector<std::string> getAvailableLanguageStandards() const;
+
+	std::vector<FilePath> getClasspaths() const;
+	std::vector<FilePath> getAbsoluteClasspaths() const;
+	void setClasspaths(const std::vector<FilePath>& classpaths);
+
+	FilePath getMavenProjectFilePath() const;
+	FilePath getAbsoluteMavenProjectFilePath() const;
+	void setMavenProjectFilePath(const FilePath& path);
+
+	FilePath getMavenDependenciesDirectory() const;
+	FilePath getAbsoluteMavenDependenciesDirectory() const;
+	void setMavenDependenciesDirectory(const FilePath& path);
+
+	bool getShouldIndexMavenTests() const;
+	void setShouldIndexMavenTests(bool value);
+
+private:
+	virtual std::vector<std::string> getDefaultSourceExtensions() const;
+	virtual std::string getDefaultStandard() const;
+
+	std::vector<FilePath> m_classpaths;
+	FilePath m_mavenProjectFilePath;
+	FilePath m_mavenDependenciesDirectory;
+	bool m_shouldIndexMavenTests;
+};
+
+#endif // SOURCE_GROUP_SETTINGS_JAVA_H