Remove useless and unused SVG elements

- Remove unused imports of xlink.
- Remove comments about which application originally wrote the text file. It's untrue because PyCharm edited it, etc.
- Remove unused IDs.
- Remove unused colours for icons rendered with RecolorImage.
- Remove useless x and y positions on 0, which is the default.
- Remove useless style setting the background to transparent.
- Remove useless whitespace in the path d attribute, and remove the then-useless XML space preserving attribute.
- Remove unused groups.
- Remove unused CSS classes.

Contributes to issue CURA-8342.

plugins/Toolbox/resources/images/Shop.svg

@@ -1,7 +1,6 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<svg version="1.1" id="Artwork" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
-	 viewBox="0 0 24 24" style="enable-background:new 0 0 24 24;" xml:space="preserve">
-<path style="fill:#000E1A;" d="M19,3H5C3.3,3,2,4.3,2,6v3c0,1.5,0.8,2.7,2,3.4V22h16v-9.6c1.2-0.7,2-2,2-3.4V6C22,4.3,20.7,3,19,3z
-	 M10,5h4v4c0,1.1-0.9,2-2,2s-2-0.9-2-2V5z M4,9V5h4v4c0,1.1-0.9,2-2,2S4,10.1,4,9z M18,20h-4v-5h-4v5H6v-7c1.2,0,2.3-0.5,3-1.4
-	c0.7,0.8,1.8,1.4,3,1.4s2.3-0.5,3-1.4c0.7,0.8,1.8,1.4,3,1.4V20z M20,9c0,1.1-0.9,2-2,2s-2-0.9-2-2V5h4V9z"/>
+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">
+<path d="M19,3H5C3.3,3,2,4.3,2,6v3c0,1.5,0.8,2.7,2,3.4V22h16v-9.6c1.2-0.7,2-2,2-3.4V6C22,4.3,20.7,3,19,3z
+	M10,5h4v4c0,1.1-0.9,2-2,2s-2-0.9-2-2V5z M4,9V5h4v4c0,1.1-0.9,2-2,2S4,10.1,4,9z M18,20h-4v-5h-4v5H6v-7c1.2,0,2.3-0.5,3-1.4
+	c0.7,0.8,1.8,1.4,3,1.4s2.3-0.5,3-1.4c0.7,0.8,1.8,1.4,3,1.4V20z M20,9c0,1.1-0.9,2-2,2s-2-0.9-2-2V5h4V9z" />
 </svg>