add first Qt6 version of musredit, mupp, etc.

src/musredit_qt6/musredit/icons/document-print-dark.svg

@@ -0,0 +1,14 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 22 22">
+  <defs id="defs3051">
+    <style type="text/css" id="current-color-scheme">
+      .ColorScheme-Text {
+        color:#f2f2f2;
+      }
+      </style>
+  </defs>
+ <path 
+    style="fill:currentColor;fill-opacity:1;stroke:none" 
+	d="m5 3v1 4h-2v1 7h1 3v2 1h8v-1-2h4v-1-6-1h-2v-4-1h-12m1 1h10v4h-1v-1h-8v1h-1v-4m1 1v1h8v-1h-8m-3 4h14v6h-2v-2h-10v2h-2v-6m10 1v1h3v-1h-3m-6 6h6v2h-6v-2"
+    class="ColorScheme-Text"
+    />
+</svg>