Allowing a motion for modification of sentence to be filed within 90 days after imposition of a sentence; prohibiting a court from increasing a sentence on a motion for modification of sentence; prohibiting a court from reducing a sentence below the sentencing guidelines; requiring that the State's Attorney provide notice to victims regarding a motion for modification of sentence and whether there will be a hearing; prohibiting a court from revising a sentence after 5 years from the date of sentencing; etc.