Gettext++, Object::title(), TechGraph++

- localisation generation bugs fixed
- matrix
  * Object::title() / Object::getTitle(), overriden for Bot to "name (class)"
- nirvana
  * TechGraph
    + moved to @tech/
    + merging between packages
    + saved games resistant to graph changes
- builder
  * data packages can be build with missing references to textures, models,
    sounds ...
- scripts
  * gettext-base.sh -> gettext-internal.sh, appends to oz_base.pot
- data
  * experimental stuff split to oz_test package