Implement new icons for Instance, Holdings, Items (Refined UX design)

Purpose: The refined UX design for Inventory has several new content types icons, which we need to implement. These new icons must be available in the folder probably called "icons" (STCOR-117)

Here the list of content type icons:

1. Instance record
   • general icon instance records (to the left of the the Resource title, 2. pane, and in the top bar on 3rd pane)
   • publisher icon (to the left of the Publisher data, 2. pane)
   • resource type (to the left of Resource Type data, 2. pane, and in the top bar on 3rd pane)
2. Holdings record
   • general icon for holdings records (to the left of the Location data, 2. pane)
   • multiple general icons for holdings records (in the level navigation bar, 3rd pane)
3. Item record
   • general icon for item records (to the left of the Barcode, 2. pane)
   • item status icon - available and not available (to the left of the Item Status, 2. pane)
   • material type icon (to the left of the material type, e.g. DVD, CD-ROM, 2. pane).

For more specifications see the attached png