vteapp: Add --cursor-shape option
vteapp: Add --cursor-shape option

Use --cursor-shape=block|ibeam|underline to test cursor shapes.

pjm0616/vte,flaxandteal/gasket-vte,rvu95/vte,rvu95/vte,saitoha/vte-sixel,thestinger/vte-ng,thestinger/vte-ng,jessevdk/vte,thestinger/vte-ng,rvu95/vte,flaxandteal/gasket-vte,jessevdk/vte,aligo/vte,gloob/vte-copy,jessevdk/vte,rvu95/vte,asivokon/vte-fx,flaxandteal/gasket-vte,gloob/vte-copy,asivokon/vte-fx,asivokon/vte-fx,gloob/vte-copy,flaxandteal/gasket-vte,saitoha/vte-sixel,pjm0616/vte,jessevdk/vte,aligo/vte,asivokon/vte-fx,saitoha/vte-sixel,aligo/vte,pjm0616/vte