Use Box Drawing Characters

[jjophoven]

Is your feature request related to a problem? Please describe.
Using + and = is an alright way of creating boxes but what would be better is using box drawing characters.

┌───────┐
│       │
│       │
└───────┘

Describe the solution you'd like
Create a .json file with maps to different directions of each box character (up, down, left, right). I have done this before so I can share some of my code with you.
┬ would be down, left, and right. ├ would be up, down, right ─ would be left and right. ┌ would be down and right.

Could also include different styles and thicknesses of outline. ┌─────┐ vs ╒═════╕ (The characters also support having one side of a box being a double stroke while the rest of it is normal).

[lxgr-linux]

Hey, I mean box characters are quite heavily in use already. Also different thicknesses and all:

Except for fightmap, because I feel like the boxes on fightmap are not "windows/overlay boxes".