logic: Added SourceGroupCustomCommand to use with SourcetrailDB binaries

* Added new Source Group type SourceGroupCustomCommand to UI and ProjectSettings
* The Source Group executes a specified command on every source file
* The variables $SOURCE_PATH, $PROJECT_PATH, $DB_PATH, $STORAGE_VERSION can be passed
* The commands are executed after all other source groups finished indexing
* The command is executed with working directory set to project directory
* Errors during command execution are shown as status update and in the Status View
* SourceGroupCustomCommand cannot be partially cleared, when one file needs clearing the project must be fully re-indexed

src/lib/settings/SourceGroupSettingsWithJavaStandard.h

@@ -5,10 +5,12 @@
 #include <string>
 #include <vector>
 
+#include "SourceGroupSettingsBase.h"
+
 class ConfigManager;
-class ProjectSettings;
 
 class SourceGroupSettingsWithJavaStandard
+	: virtual public SourceGroupSettingsBase
 {
 public:
 	static std::wstring getDefaultJavaStandardStatic();
@@ -28,7 +30,6 @@ protected:
 	void save(std::shared_ptr<ConfigManager> config, const std::string& key);
 
 private:
-	virtual const ProjectSettings* getProjectSettings() const = 0;
 	std::wstring getDefaultJavaStandard() const;
 
 	std::wstring m_javaStandard;