Check_MK Werk 0390: Added an icon selector to the view editor

ID: 0390 Title: Added an icon selector to the view editor Component: Multisite Level: 2 Class: New Feature Version: 1.2.5i1 Each view can have a small icon which is used, for example, in context buttons linking to these views. The icons had to be configured by putting the icon name to a text field. This was not user friendly. This change adds an icon chooser to the view editor.