Remove the fact page needs to be specific in most widgets #253

Widgets of the package org.openlowcode.server.graphic.widget currently require in their syntax the parent SPage given as argument, making the syntax heavier than it should.

Example before:

SComponentBand mainband = new SComponentBand(SComponentBand.DIRECTION_DOWN,this);

Example after

SComponentBand mainband = new SComponentBand(SComponentBand.DIRECTION_DOWN);