Use WireframeColor to override global color

[IceSentry]

Objective

• The docs says the WireframeColor is supposed to override the default global color but it doesn't.

Solution

• Use WireframeColor to override global color like docs said it was supposed to do.
• Updated the example to document this feature
• I also took the opportunity to clean up the code a bit

Fixes #13032

[alice-i-cecile]

@galop1n your review would be welcome here if you feel comfortable taking a peek at the internals.