Better symbolic icons

A lot of the old symbolic icons were not very geometric and off
the 16x16 grid. This brings them in line with the GNOME style for
symbolic icons and aligns them to the pixel grid where possible.

icons/mail-archive-symbolic.svg

@@ -1,26 +1,57 @@
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-<!-- Created with Inkscape (http://www.inkscape.org/) -->
-
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-  <sodipodi:namedview inkscape:bbox-nodes='true' inkscape:bbox-paths='true' bordercolor='#666666' borderlayer='false' borderopacity='1' inkscape:current-layer='layer12' inkscape:cx='7.6390264' inkscape:cy='1.692314' gridtolerance='10' inkscape:guide-bbox='true' guidetolerance='10' id='namedview88' inkscape:object-nodes='true' inkscape:object-paths='true' objecttolerance='10' pagecolor='#333333' inkscape:pageopacity='1' inkscape:pageshadow='2' showborder='true' showgrid='false' showguides='true' inkscape:showpageshadow='true' inkscape:snap-bbox='true' inkscape:snap-bbox-edge-midpoints='true' inkscape:snap-bbox-midpoints='true' inkscape:snap-global='true' inkscape:snap-grids='true' inkscape:snap-intersection-paths='true' inkscape:snap-nodes='true' inkscape:snap-others='false' inkscape:snap-smooth-nodes='true' inkscape:snap-to-guides='true' inkscape:window-height='715' inkscape:window-maximized='1' inkscape:window-width='1366' inkscape:window-x='0' inkscape:window-y='27' inkscape:zoom='1'>
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-  </sodipodi:namedview>
-  <metadata id='metadata90'>
+<?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"
+   version="1.1"
+   width="16"
+   height="16"
+   id="svg7384"
+   sodipodi:docname="mail-archive-symbolic.svg"
+   inkscape:version="0.92.4 (5da689c313, 2019-01-14)">
+  <sodipodi:namedview
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1"
+     objecttolerance="10"
+     gridtolerance="10"
+     guidetolerance="10"
+     inkscape:pageopacity="0"
+     inkscape:pageshadow="2"
+     inkscape:window-width="1191"
+     inkscape:window-height="650"
+     id="namedview10"
+     showgrid="false"
+     inkscape:zoom="14.75"
+     inkscape:cx="3.5254237"
+     inkscape:cy="7.4576271"
+     inkscape:window-x="0"
+     inkscape:window-y="27"
+     inkscape:window-maximized="0"
+     inkscape:current-layer="svg7384" />
+  <title
+     id="title9167">Gnome Symbolic Icon Theme</title>
+  <defs
+     id="defs9" />
+  <metadata
+     id="metadata90">
     <rdf:RDF>
-      <cc:Work rdf:about=''>
+      <cc:Work
+         rdf:about="">
         <dc:format>image/svg+xml</dc:format>
-        <dc:type rdf:resource='http://purl.org/dc/dcmitype/StillImage'/>
-        <dc:title/>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title>Gnome Symbolic Icon Theme</dc:title>
       </cc:Work>
     </rdf:RDF>
   </metadata>
-  <defs id='defs7386'>
-    <linearGradient id='linearGradient5606' osb:paint='solid'>
-      <stop id='stop5608' offset='0' style='stop-color:#000000;stop-opacity:1;'/>
-    </linearGradient>
-  </defs>
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-    
-  </g>
+  <path
+     inkscape:connector-curvature="0"
+     style="display:inline;fill:#bebebe;fill-opacity:1;fill-rule:nonzero;stroke:none;enable-background:new"
+     d="M 4,1 C 3,1 3,2 3,2 H 13 C 13,2 13,1 12,1 Z M 3,3 C 2.02773,3 2,4 2,4 H 14 C 14,4 14,3 13,3 Z M 2,5 A 1.0001,1.0001 0 0 0 1,6 v 9 a 1.0001,1.0001 0 0 0 1,1 h 12 a 1.0001,1.0001 0 0 0 1,-1 V 6 A 1.0001,1.0001 0 0 0 14,5 Z m 2.60156,2 h 6.79883 L 8,9.71875 Z M 3,8.277344 l 5,4.001953 5,-4 V 14 H 3 Z"
+     id="path8812-7" />
 </svg>