NWN:Fix the double display of portrait in Chargen.
Do not show twice the human portrait for halfelf in the portrait chooser.
Aurora: Add new methods for widgets.
Add two methods:
- Center vertically the widgets from its parents.
- Get a child's widget from its tag.
NWN: Add setters and getters to Creature.

Getters:
- Get the total level of the creature.
- Get the creature's last level. Maybe we should remember all the levels and not the last one.
Setters:
- Set AppearanceID.
- Set phenotype.
- Set alignment.

Two other methods have been added:
- Increase the level by one for a given class.
- Decrease the level by one for the last class.
NWN: Add caption's methods and a mode to Button.

Add methods to handle the caption's button and a new mode to have a static button.
NWN: fix a bug in the Editbox widget.

When the number of lines was exactly 18, the scrollbar didn't appear.
NWN: Add a new kind of item in the Listbox widget.

Add button item for the listbox. The button's item has a caption and an icon.
NWN: Clean up for the character generator.
NWN: Add some character's generator aspect.

Some aspects are not completely implemented.
Revert "NWN: Add setters and getters to Creature."

This reverts commit c26c7a32452e26d1dc131c13617b645d30c0d715.

Oups.
NWN: Fix the listbox widget.
NWN: Add setters and getters to Creature.

    Getters:
    - Get the total level of the creature.
    - Get the creature's last level. Maybe we should remember all the levels and not the last one.
    Setters:
    - Set AppearanceID.
    - Set phenotype.
    - Set alignment.

    Two other methods have been added:
    - Increase the level by one for a given class.
    - Decrease the level by one for the last class.

(good version)
NWN: Add icon size to portrait.

Maybe, we should rename the class to avoid confusion as it can be used for any images.
Or create a new class (but the code is pretty small).
NWN: Fix listbox widget.

Forgot to add the header.