Set up Icons on calendar

[marsson]

As a system administrator, I want to be able to configure the Icon that is displayed in my calendar page.

Given there is a calendar with a valid configuration name
AND the configuration object has set a Icon
AND the the Icon is VALID,
THEN, the right Icon should be displayed in the Calendar Component.

Below a list of the valid system Icons:
https://www.lightningdesignsystem.com/icons/