[Bug-ed] Editing text with terminal escape codes

[Criveti Mihai]

Honestly, can't tell if this is a bug or ed just 'works as designed'. Either way, the test case is appropriate given the significance of today's date :-).

# Summary:

Editing text containing terminal escape codes with `ed` could lead to having said codes interpreted by the terminal - making `ed` unusable (requiring something unwieldy like `vi` or `emacs` to solve the problem).

The outcome is similar to using `cat` on a binary file.

# How to reproduce:

1. Download `https://raw.githubusercontent.com/minimaxir/big-list-of-naughty-strings/master/blns.txt` (escape codes could be stripped by mail clients, etc. so it's best to download this test case).

2. Edit the file with `ed`, and print (1,$n or 1,$p or whatever the line number is, etc.) out the following line:
```
Roses are red, violets are blue. Hope you enjoy terminal hue
```

Outcome: your terminal is now blue :-).

Expected result: the line is printed as plain text.

Cheers!