Last Update for a while

- Conversation Manager finished
- Added StartMenuState:
+ You can choose buttons, offsets and arrangement and finally clicking
in any of them they will some StageState setted by Unity Inspector with
drag & Drop
+ Everything looks working kind good

Issues:
- Need some Optimization, The Background and Title Prefab keeps loaded
from the MainMenu Screen and never are closed (but they are hidden in a
corner. )
- The Buttons Fit Really well in Horizontal with the Offset variable but
it needs the same solution in Vertical (still had a good algorythm for
make buttons grids)
- Need some Interaction with Keyboard and a Return Button.