Add basic Itinerary integration

After downloading a file, the model calls the extractor and uses the
JSON to show some basic information about the content and allows to import
the data to Itinerary. This is entirely runtime-optional; no build-time dependencies
are required and nothing changes if the extractor isn't available.

src/CMakeLists.txt

@@ -144,6 +144,8 @@ add_library(neochat STATIC
     models/timelinemodel.cpp
     models/timelinemodel.h
     enums/pushrule.h
+    models/itinerarymodel.cpp
+    models/itinerarymodel.h
 )
 
 qt_add_qml_module(neochat URI org.kde.neochat NO_PLUGIN
@@ -303,6 +305,8 @@ qt_add_qml_module(neochat URI org.kde.neochat NO_PLUGIN
         qml/glowdot.png
 )
 
+configure_file(config-neochat.h.in ${CMAKE_CURRENT_BINARY_DIR}/config-neochat.h)
+
 if(WIN32)
     set_target_properties(neochat PROPERTIES OUTPUT_NAME "neochatlib")
 endif()