[enh] allow override of blocked engines from query string
[enh] allow override of blocked engines from query string

pointhi/searx,potato/searx,kdani3/searx,kdani3/searx,GreenLunar/searx,PwnArt1st/searx,matejc/searx,asciimoo/searx,jibe-b/searx,jcherqui/searx,dzc34/searx,asciimoo/searx,kdani3/searx,GreenLunar/searx,potato/searx,jcherqui/searx,jibe-b/searx,jpope777/searx,jibe-b/searx,dzc34/searx,gugod/searx,framasoft/searx,misnyo/searx,GreenLunar/searx,jcherqui/searx,dalf/searx,dalf/searx,matejc/searx,potato/searx,misnyo/searx,PwnArt1st/searx,gugod/searx,jibe-b/searx,PwnArt1st/searx,dzc34/searx,asciimoo/searx,jpope777/searx,framasoft/searx,pointhi/searx,PwnArt1st/searx,asciimoo/searx,dalf/searx,matejc/searx,pointhi/searx,jpope777/searx,gugod/searx,pointhi/searx,misnyo/searx,potato/searx,framasoft/searx,gugod/searx,jcherqui/searx,framasoft/searx,dzc34/searx,GreenLunar/searx,misnyo/searx,jpope777/searx,kdani3/searx,matejc/searx,dalf/searx