- missing overrides
- passed normal string to factored function to draw strings
- deleted unused elements

- introducing the notion of: "the text is too small so we do not draw
it" with the help of the function isTextReadable
- removed CanTextGoInTheBox function as it was repeating itself, and
moved it in TGScalableComponent which is way up in the inheritance
- fixed missing initScaling in some diagrams + removed other added
elements such as TextY which is already inherited

- added center calculating function for internal drawing in TGC scalable
with internal component
- removed the same function from avatarPDBlock
- rewrote internalDrawing: fixed the bug of text zooming after zoom

- after a zoom, text would zoom after clicking on the screen or hovering
the mouse over the text/box.
- the text will now zoom and scale correctly, same goes for the icon and
the compartment for the title and stereotype

- useless keywords
- code clean//overrides
- need fix bug : strange zoom please refer to TMLComponentDiag to change
code

Cleaning code and adding/fixing documentation:
- more precision
- unnecessary element removed for more readability
- as for issue 31, fixed the logo resizing for avatarPDBlock