Use nlohmann::json for all documentation.

The printout is verified to be the same as before, except for 1) some escape characters which are no longer necessary and 2) strings that contained arrays have now become arrays in the json

include/openspace/scripting/scriptengine.h

@@ -27,8 +27,8 @@
 
 #include <openspace/util/syncable.h>
 #include <openspace/documentation/documentationgenerator.h>
-
 #include <openspace/scripting/lualibrary.h>
+#include <openspace/json.h>
 #include <ghoul/lua/luastate.h>
 #include <ghoul/misc/boolean.h>
 #include <filesystem>
@@ -96,6 +96,7 @@ public:
     std::vector<std::string> allLuaFunctions() const;
 
     std::string generateJson() const override;
+    nlohmann::json generateJsonJson() const;
 
 private:
     BooleanType(Replace);