Implement CSV / TSV import (#45)

- add csv/tsv importer
- add `make_map` script function
- add `alt name` field property
- add `construction script` field property
- add `construction script` game property

src/gui/control/card_list.hpp

@@ -77,7 +77,8 @@ public:
   bool doCopy() override;
   bool doPaste() override;
   bool doDelete() override;
-  
+  bool doAddCSV();
+
   // --------------------------------------------------- : Set actions
   
   void onBeforeChangeSet() override;