Allow PCX format custom insignia

[Flactine]

Description

Allow use .pcx format insignia instead of .shp format.

INI code

[TechnoType]
Insignia.Rookie= (filename, excluding the .pcx extension)
Insignia.Veteran= (filename, excluding the .pcx extension)
Insignia.Elite= (filename, excluding the .pcx extension)

Additional context

No response

Checklist

• The suggestion is NOT related to functionality of Ares, HAres, Kratos or any other YR engine extension.
• The suggested feature / enhancement is NOT implemented in Ares/Phobos yet and the existing possibilites are not viable or good enough to achieve the wanted result.
• I agree to elaborate the details if requested and provide thorough testing if the feature is implemented.
• I added a very descriptive title to this topic.
• I used the GitHub search and read the topic list to find a similar topic and didn't find it.
• I thought out how the feature / enhancement should work and described it in the most detailed and clear way.