Added support for configuration file

- BASE_PATH is set using the openspace.cfg file. The binary will look
upwards in the directory hierarchy until it is found.
- All other paths is defined in the configurationfile. Paths may be
absolute or relative using the ${BASE_PATH} token
- Moved SGCT configuration files to its own folder
- Updated tests to support new configuration loading

- TODO: Make the loading of configuration easier for the programmer.

include/openspace/engine/openspaceengine.h

@@ -28,6 +28,7 @@
 #include <openspace/interaction/interactionhandler.h>
 #include <openspace/rendering/renderengine.h>
 #include <ghoul/misc/configurationmanager.h>
+#include <ghoul/misc/dictionary.h>
 
 namespace openspace {
 
@@ -35,14 +36,17 @@ class ScriptEngine;
 
 class OpenSpaceEngine {
 public:
-    static void create(int argc, char** argv, int& newArgc, char**& newArgv);
+    static void create(int argc, char** argv, std::vector<std::string>& sgctArguments);
     static void destroy();
     static OpenSpaceEngine& ref();
 
     static bool isInitialized();
     bool initialize();
-    static bool registerFilePaths();
-
+    
+    static bool registerPathsFromDictionary(const ghoul::Dictionary& dictionary);
+    static bool registerBasePathFromConfigurationFile(const std::string& filename);
+    static bool findConfiguration(std::string& filename) ;
+    
     ghoul::ConfigurationManager& configurationManager();
     InteractionHandler& interactionHandler();
     RenderEngine& renderEngine();