Mod splash screens

**What do you want to see?**
Each mod should be able to display a splash screen, like it does in SE4.

**How would it help players?**
You can tell which mod you're about to launch! Amazing!

**Alternatives**
Text? Icons?

**Screenshots and mockups**
blah blah

**Things to consider**
Don't need to display an SE4 splash screen for stock...