(Deprecate) Remove Node.setIntColor

[remikey]

As for Node.setRandomColor, which as been deprecated in favor of a Color method, Node.setIntColor and Node.getIntColor should be deprecated:

• Node.setIntColor: must be deprecated and the dedicated code should be moved to Color and improved if possible
• Node.getIntColor : must be deprecated, Node.getColor should be used instead.

[remikey]

Applied. In particular:

• Node.setIntColor and Node.getIntColor are deprecated;
• Color Color.getIntColor(n) (int parameter) will return the same value from one run to another;
• int Color.getIntColor() (no parameter) tries to return the index of the current Color object in the basicColors array and returns -1 if not found;
• new method Color.getRandomColor(Random) allows to generate a Color with the provided Random
• Color.equals and Color.hashCode have been provided for test purpose

[remikey]

After discussion with @acasteigts , some renaming/changes:

• Color Color.getIntColor(int) is now Color Color.getColorAt(int)
• int Color.getIntColor() is now int Color.indexOf(Color), and is static
• Color.getBasicColors() in now Color.getIndexedColors()