Allow turning off invalid character replacement

[1over137]

Is your feature request related to a problem? Please describe.
SingleFile replaces some characters to be a different one. But this loses information and makes the filename hard to read.

Describe the solution you'd like
On Linux all of those characters are allowed. It would be useful to be able to limit the replacement to control characters in case they are present.

[gildas-lormeau]

Can you give me a specific example of a character replacement you don't want? The hidden option filenameReplacedCharacters might be helpful.

[1over137]

I mostly want to have colons in the filename to show the datetime properly. I tried to change that but it refuses to save the file

SingleFile filename must not contain illegal characters undefined [sandbox eval code:4:21432](chrome://devtools/content/webconsole/sandbox%20eval%20code)
    Lt sandbox eval code:4
    <anonymous> sandbox eval code:4
    <anonymous> sandbox eval code:4```

There could be a firefox issue here though. Firefox wouldn't let you save a filename with colons even if you specify it, for example.

[gildas-lormeau]

I don't have a Linux machine to test as I write this, but perhaps disabling Misc. > save pages in background might help get around this error.