revised icons for the GUI * icons/octave/128x128/go-hom.png: redesign * icons/octave/128x128/figure-zoom-in.png: redesign * icons/octave/128x128/figure-zoom-original.png: redesign * icons/octave/128x128/figure-zoom-out.png: redesign * icons/octave/128x128/view-zoom-in.png: redesign * icons/octave/128x128/view-zoom-original.png: redesign * icons/octave/128x128/view-zoom-out.png: redesign * icons/octave/scalable/go-hom.scg: redesign * icons/octave/scalable/figure-zoom-in.svg: redesign * icons/octave/scalable/figure-zoom-original.svg: redesign * icons/octave/scalable/figure-zoom-out.svg: redesign * icons/octave/scalable/view-zoom-in.svg: redesign * icons/octave/scalable/view-zoom-original.svg: redesign * icons/octave/scalable/view-zoom-out.svg: redesign * icons/license.md: updated accordingly

<svg height="24px" width="24px" id="Camada_1" data-name="Camada 1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 24 24"><defs><style>.cls-1{fill:url(#Gradiente_sem_nome_3);}</style><linearGradient id="Gradiente_sem_nome_3" x1="7.1767" y1="4.5166" x2="16.8882" y2="21.3373" gradientUnits="userSpaceOnUse"><stop offset="0" stop-color="#199ae1"/><stop offset="1" stop-color="#017ad5"/></linearGradient></defs><path class="cls-1" d="M20.9734,10.4733l-8.3411-8.341a.8942.8942,0,0,0-1.2646,0l-8.341,8.341A.8943.8943,0,0,0,3.659,12H6v8.2929A.7071.7071,0,0,0,6.7071,21H9.2929A.7071.7071,0,0,0,10,20.2929V15h4v5.279a.721.721,0,0,0,.7209.721h2.5582A.721.721,0,0,0,18,20.279V12h2.341A.8943.8943,0,0,0,20.9734,10.4733Z"/></svg>