WIP minetest <-> laby import/export

- currently possible to export a laby into minetest
- start of a lua content parser to import .we into lab

java/org/artisanlogiciel/lua/LuaSequence.java

@@ -0,0 +1,43 @@
+package org.artisanlogiciel.lua;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class LuaSequence
+extends  LuaObject{
+    List<LuaObject> items;
+
+    public LuaSequence()
+    {
+        items = new ArrayList<>();
+    }
+
+    void addObject(LuaObject object)
+    {
+        if ( object == null )
+        {
+            System.err.println("adding null tuple");
+        }
+        items.add(object);
+
+    }
+
+    @Override
+    public String toString()
+    {
+        StringBuffer buffer = new StringBuffer();
+        buffer.append('{');
+        if (items.size() > 0) {
+            buffer.append(items.get(0).toString());
+            if (items.size() > 1) {
+                for (int i = 1; i < items.size(); i ++)
+                {
+                    buffer.append(',');
+                    buffer.append(items.get(i).toString());
+                }
+            }
+        }
+        buffer.append('}');
+        return buffer.toString();
+    }
+}