0.5: settlement's infrastructures list update - status icons

Here's a crude screenshot of the infrastructure status icons.

 These ones indicate the status of each infrastructures, among 5 possible:

• The yellow one indicate the In Conversion/Assembling/Building status.
• The orange one indicate the Disabled status.
• The blue one indicate the In Transition status.
• The green one indicate the Operational status.
• The last one (not displayed in the screenshot), a white cross in front of a red circle, indicate the Destroyed status.

Thanks to Brightmix from OpenGameArt for these icons (the credits are updated) :)