refs #445, encapsulated web service based reading in CWebDataReader

* the reader will be used in context, but can also be used standalone (ie mapping GUI) GUI
* adjustments in context/airspace as required
** for web reader
** livery
* base class for database based reading (via JSON/web)
* model data reader for models

src/blackcore/context.cpp

@@ -15,6 +15,12 @@ using namespace BlackMisc;
 namespace BlackCore
 {
 
+    const CLogCategoryList &CContext::getLogCategories()
+    {
+        static const BlackMisc::CLogCategoryList cats { BlackMisc::CLogCategory::context() };
+        return cats;
+    }
+
     IContextNetwork *CContext::getIContextNetwork()
     {
         return this->getRuntime()->getIContextNetwork();