Reimplemented PictureLoader as a singleton

* Removed remaining picture handling from card database and cardinfo
 * removed the “noCard object” hack

oracle/CMakeLists.txt

@@ -12,6 +12,7 @@ SET(oracle_SOURCES
     src/oraclewizard.cpp
     src/oracleimporter.cpp
     ../cockatrice/src/carddatabase.cpp
+    ../cockatrice/src/pictureloader.cpp
     ../cockatrice/src/settingscache.cpp
     ../cockatrice/src/shortcutssettings.cpp
     ../cockatrice/src/settings/carddatabasesettings.cpp

oracle/src/oracleimporter.h

@@ -2,6 +2,7 @@
 #define ORACLEIMPORTER_H
 
 #include <QMap>
+#include <QVariant>
 
 #include <carddatabase.h>