More property work

Add StringProperty
Add possibility for callbacks
Switch RenderablePlanet to use Properties

include/openspace/properties/stringproperty.h

@@ -0,0 +1,54 @@
+/*****************************************************************************************
+*                                                                                       *
+* OpenSpace                                                                             *
+*                                                                                       *
+* Copyright (c) 2014                                                                    *
+*                                                                                       *
+* Permission is hereby granted, free of charge, to any person obtaining a copy of this  *
+* software and associated documentation files (the "Software"), to deal in the Software *
+* without restriction, including without limitation the rights to use, copy, modify,    *
+* merge, publish, distribute, sublicense, and/or sell copies of the Software, and to    *
+* permit persons to whom the Software is furnished to do so, subject to the following   *
+* conditions:                                                                           *
+*                                                                                       *
+* The above copyright notice and this permission notice shall be included in all copies *
+* or substantial portions of the Software.                                              *
+*                                                                                       *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,   *
+* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A         *
+* PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT    *
+* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF  *
+* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE  *
+* OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                                         *
+****************************************************************************************/
+
+#ifndef __STRINGPROPERTY_H__
+#define __STRINGPROPERTY_H__
+
+#include <openspace/properties/templateproperty.h>
+
+namespace openspace {
+namespace properties {
+
+class StringProperty : public TemplateProperty<std::string> {
+public:
+    StringProperty(std::string identifier, std::string guiName);
+    StringProperty(std::string identifier, std::string guiName, std::string value);
+
+    using TemplateProperty<std::string>::operator=;
+};
+
+template <>
+std::string PropertyDelegate<TemplateProperty<std::string>>::className();
+
+template <>
+template <>
+std::string PropertyDelegate<TemplateProperty<std::string>>::defaultValue<std::string>();
+
+//REGISTER_TEMPLATEPROPERTY_HEADER(StringProperty, std::string);
+
+
+} // namespace properties
+} // namespace openspace
+
+#endif // __STRINGPROPERTY_H__