Added One2Many attribute
Added foreing key attribute
Added OnUpdateCascade and OnDeleteCascade attributes
Added methods IsOnUpdateCascade and IsOnDeleteCascade to Orm
SqlDecl() was updated
Corrected error with "foreign" (to "foreing")
ForeignKeyAttribute renamed to ReferencesAttribute. Added new ForeignKeyAttribute whitout logic
Added case to SqlDecl() when p has Foreign Key