Graphics project structure change

Multiple inheritance implemented

Specs interfaces:

• Evolvable: allows to evolve/update the current status
• Renderable: allows to render the current status
• Positionable: allows to load the current position
• Orientable: allows to orientate the object using angular coordinates
• Scalable: allows to scale the object
• Colorable: allows to assign a color to the object
• Descriptable: allows to assign a physics or mathematical behaviour

Actors:

• SKActor inherits Evolvable:
  
  This is the abstract base class which implements an evolvable behaviour A Scene will take SKActors as arguments and nothing more

• Shape inherits SKActor, Renderable, Colorable:
  
  This is the abstract class for a single graphical object instanciation

• Decoration inherits Shape, Positionable, Orientable, Scalable:
  
  This a graphical object which has the evolution flag disabled It can be positioned, oriented and scaled

• Particle inherits Shape, Descriptable
  
  This object implements a descriptable behaviour Precisely the descriptor associated to this class is the NewtonDescriptor So you can bind forces dynamically and it doesn't depend on a fixed differential equation

• ParticleSystem inherits SKActor, Renderable
  
  This is a container for Particle instances It performs dynamic interactions definible in subclasses

Others:

• sktools.h
  
  This header contains public fonctions for opengl rendering and matrix binding.

• specs.h
  
  This header contains the specs flags definitions. The flags system uses macros in order to bind the right functions using the most optimal implementation.

Overview on the specs flags:

The idea is to group all boolean flags into single bits
A SKActor contains a number such that, every bit of this
number corresponds to a flag bit.
Flags bits are:

- S_EVOLVE      0x1
- S_RENDER      0x2
- S_FILL_MODE   0x4
- S_POSITION    0x8
- S_ORIENTATION 0x10
- S_SCALING     0x20
- S_COLOR       0x40

Every flags is related to a particular specs interface