Notifications & warning dialog

notifications
dialog with warnings produced by slicing is shown before exporting

resources/icons/cross_focus_large.svg

@@ -0,0 +1,81 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   inkscape:version="1.0 (4035a4fb49, 2020-05-01)"
+   sodipodi:docname="cross_megafocus.svg"
+   xml:space="preserve"
+   enable-background="new 0 0 16 16"
+   viewBox="0 0 16 16"
+   y="0px"
+   x="0px"
+   id="Layer_1"
+   version="1.0"><metadata
+   id="metadata16"><rdf:RDF><cc:Work
+       rdf:about=""><dc:format>image/svg+xml</dc:format><dc:type
+         rdf:resource="http://purl.org/dc/dcmitype/StillImage" /></cc:Work></rdf:RDF></metadata><defs
+   id="defs14" /><sodipodi:namedview
+   inkscape:current-layer="Layer_1"
+   inkscape:window-maximized="1"
+   inkscape:window-y="-9"
+   inkscape:window-x="-9"
+   inkscape:cy="8"
+   inkscape:cx="8"
+   inkscape:zoom="47.0625"
+   showgrid="false"
+   id="namedview12"
+   inkscape:window-height="1721"
+   inkscape:window-width="3200"
+   inkscape:pageshadow="2"
+   inkscape:pageopacity="0"
+   guidetolerance="10"
+   gridtolerance="10"
+   objecttolerance="10"
+   borderopacity="1"
+   bordercolor="#666666"
+   pagecolor="#ffffff" />
+<g
+   style="opacity:1;fill-opacity:1"
+   transform="matrix(1.1,0,0,1.1,-0.8,-0.8)"
+   id="cross">
+	<g
+   style="fill-opacity:1"
+   id="g4">
+		
+			<line
+   style="fill-opacity:1"
+   id="line2"
+   y2="14"
+   x2="2"
+   y1="2"
+   x1="14"
+   stroke-miterlimit="10"
+   stroke-linecap="round"
+   stroke-width="3"
+   stroke="#ed6b21"
+   fill="none" />
+	</g>
+	<g
+   style="fill-opacity:1"
+   id="g8">
+		
+			<line
+   style="fill-opacity:1"
+   id="line6"
+   y2="14"
+   x2="14"
+   y1="2"
+   x1="2"
+   stroke-miterlimit="10"
+   stroke-linecap="round"
+   stroke-width="3"
+   stroke="#ed6b21"
+   fill="none" />
+	</g>
+</g>
+</svg>