Notifications & warning dialog

notifications
dialog with warnings produced by slicing is shown before exporting

resources/icons/timer_dot.svg

@@ -0,0 +1,72 @@
+<?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:xlink="http://www.w3.org/1999/xlink"
+   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="timer_dot.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="metadata11"><rdf:RDF><cc:Work
+       rdf:about=""><dc:format>image/svg+xml</dc:format><dc:type
+         rdf:resource="http://purl.org/dc/dcmitype/StillImage" /><dc:title /></cc:Work></rdf:RDF></metadata><defs
+   id="defs9"><linearGradient
+     id="linearGradient830"
+     inkscape:collect="always"><stop
+       id="stop826"
+       offset="0"
+       style="stop-color:#000000;stop-opacity:1;" /><stop
+       id="stop828"
+       offset="1"
+       style="stop-color:#000000;stop-opacity:0;" /></linearGradient><radialGradient
+     gradientUnits="userSpaceOnUse"
+     r="3.5"
+     fy="8"
+     fx="8"
+     cy="8"
+     cx="8"
+     id="radialGradient832"
+     xlink:href="#linearGradient830"
+     inkscape:collect="always" /></defs><sodipodi:namedview
+   inkscape:document-rotation="0"
+   inkscape:current-layer="Layer_1"
+   inkscape:window-maximized="1"
+   inkscape:window-y="-11"
+   inkscape:window-x="-11"
+   inkscape:cy="6.66147"
+   inkscape:cx="7.0304602"
+   inkscape:zoom="83.4386"
+   showgrid="false"
+   id="namedview7"
+   inkscape:window-height="2066"
+   inkscape:window-width="3840"
+   inkscape:pageshadow="2"
+   inkscape:pageopacity="0"
+   guidetolerance="10"
+   gridtolerance="10"
+   objecttolerance="10"
+   borderopacity="1"
+   bordercolor="#666666"
+   pagecolor="#ffffff" />
+<g
+   transform="matrix(0.7,0,0,0.7,2.4,2.4)"
+   style="fill:#bf6637;fill-opacity:1;stroke:none;stroke-opacity:1"
+   id="g4">
+	<circle
+   style="fill:#bf6637;fill-opacity:1;stroke:none;stroke-opacity:1"
+   id="circle2"
+   r="3"
+   cy="8"
+   cx="8" />
+</g>
+</svg>