[BUG] Out of sync errors

[gar-mil]

Observed behavior
When one of the players in a multiplayer game does not have the WERP era installed the game presents an out of sync error.

Expected behavior
Because WERP eras only use default units multiplayer games should run properly without needing the era installed.

Steps to Reproduce
Steps to reproduce the behavior:

1. Do not install a WERP era.
2. Join a multiplayer server.
3. Join a multiplayer game that is using a WERP era.
4. Wait for host to begin game.
5. Out of sync error

Desktop (please complete the following information):

• OS: Window 10
• Version 1.0

[gar-mil]

Likely caused by faction icon generation. Solution would be to refactor faction icon generation to only use vanilla graphics.