Trenches - Multiple Styles

[hbjydev]

While the current dirt mound style of trench is very useful, it'd be great to have some GRAD Trenches-inspired versions too, like the short trench and big trench;

https://steamcommunity.com/workshop/filedetails/?id=1224892496

Providing more cover while taking longer to build.

Also preferably making the inward-facing part of the trench more straight so they can be used to rest weapons on them, too! Would be great. :)