[WIP] Add tarped wagon to support unidentified vehicles

[brantwedel]

Made a comment, took some action, my first stab at working with factorio mod system: https://mods.factorio.com/mods/Supercheese/Vehicle%20Wagon/discussion/6587

This allows any vehicle to be loaded onto the wagon, if the vehicle is not detected, it falls back to a tarp covered wagon graphic.

This is [WIP] because I think the tarp graphic could be greatly improved (It's basically a modified tent model I found https://free3d.com/3d-model/puo-66928.html), I'm thinking of doing something similar to this if I have time this weekend: http://www.modelcrafters.com/wordpress/?product=us-army-53-war-emergency-gondola-wsplit-tarp-covered-load

Also, I kind of guessed on the small German localization change

I experimented with inserting items to show what was under the tarp when in "alt-mode" for when you have too many tarped wagons but that code isn't included because it was too hacky ... wonder if you have any ideas for showing that ...

[Suprcheese]

Ooh, I quite like this! I'll start testing immediately.

[Suprcheese]

This is a splendid addition indeed, and I've added it in v1.1.2.
Thanks so much for being passionate enough to take the time to add this improvement!