* FormUI		This is the main class, it generates the form itself;
 * FormController	To create groups of instances (ex: fieldsets), also to reduce infinite recurrence;
 * FormValidators	Catalog of validation functions, it can be extended if needed;
 * FormControl		Parent class to controls, it contains basic functionalities overrode in each control's class;
 * FormControl*		Every control needs a FormControl* class, FormUI literally looks for example, FormControlCheckbox.