Change rendering of units

[jrummel]

Expected Behavior

Rendering of units needs to change to use the affiliation colour as the outline and have a transparent fill.

Actual Behavior

Currently affiliation colour is used as a fill and black is used as the stroke.

[jrummel]

This issue has been revised to simply allow the configuration of the symbol colors by the developer. setIconColor method has been added to achieve this.

[jrummel]