Add PointingStick view (#263)

* Add PointingStick view

* Add icons

* fix gradient on 32

* more detail

* Extend new design to 48px (#266)

* use new design for 48px

* fix circle details

* Adjust details in 48

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Co-authored-by: William Kelso <wpkelso+github@posteo.net>

Author: danirabbit

data/mouse-touchpad.gresource.xml

@@ -25,5 +25,9 @@
     <file alias="32x32/categories/mouse-touchpad-gestures.svg" compressed="true" preprocess="xml-stripblanks">gestures/32.svg</file>
     <file alias="48x48@2/categories/mouse-touchpad-gestures.svg" compressed="true" preprocess="xml-stripblanks">gestures/48.svg</file>
     <file alias="48x48/categories/mouse-touchpad-gestures.svg" compressed="true" preprocess="xml-stripblanks">gestures/48.svg</file>
+    <file alias="32x32/categories/mouse-touchpad-pointingstick.svg" compressed="true" preprocess="xml-stripblanks">pointingstick/32.svg</file>
+    <file alias="32x32@2/categories/mouse-touchpad-pointingstick.svg" compressed="true" preprocess="xml-stripblanks">pointingstick/32.svg</file>
+    <file alias="48x48/categories/mouse-touchpad-pointingstick.svg" compressed="true" preprocess="xml-stripblanks">pointingstick/48.svg</file>
+    <file alias="48x48@2/categories/mouse-touchpad-pointingstick.svg" compressed="true" preprocess="xml-stripblanks">pointingstick/48.svg</file>
   </gresource>
 </gresources>