add direction help image to viewpoint preset

[Klumbumbus]

I recently added the direction key to my known viewpoints and I found it very useful to have the help image from ​osmwiki:Key:direction directly in the preset. I even used a plastic ruler on my screen to compare the help image with the aerial imagery :D

Any objections to add it to the default preset?

[Don-vip]

What does the patch look like?

[Klumbumbus]

data/defaultpresets.xml

@@ -4361 +4361 @@
             <key key="tourism" value="viewpoint" />
             <text key="name" text="Name" />
             <combo key="direction" text="Direction" delimiter="|" values="N|E|S|W|NE|NNE-S|180|90-270|270-90|0-360|70-110;250-290" values_no_i18n="true" values_sort="false" />
+            <space />
+            <label text="" icon="https://wiki.openstreetmap.org/w/images/e/e0/Angles.svg" icon_size="231" />
             <!--<check key="man_made" value="tower" text="Look-Out Tower" />-->
         </item> <!-- Viewpoint -->
         <separator/>

(icon path must be adjusted when icon is copied in our images folder.)

[Don-vip]

OK, no objection if the file is shipped with JOSM.

[Klumbumbus]

In 13183/josm:

fix #15613, see #14989 - add direction help image to viewpoint preset (icon from ​https://wiki.openstreetmap.org/wiki/File:Angles.svg, PD licensed)