Properly escape strings for tcsh

[cqexbesd]

Description

The code for tcsh shell integration was missing a round of escapes. This lead to unbalanced quotes and so an error from the shell when it was processed (e.g. when opening a new window).

I also swapped `\033` for `\e` as I think the later will be more readable to people using a C based shell.

Motivation and Context

Why is this change required? What problem does it solve?

Previous code didn't work and printed errors when a new shell started.

How Has This Been Tested?

I just ran it in my shell.

Checklist:

Go over all the following points, and put an x in all the boxes that apply.

If you're unsure about any of these, don't hesitate to ask. We're here to help!

• I have read the CONTRIBUTING document in my spoken language, and understand the terms
• I have updated (or added) the documentation accordingly.
• I have added tests to cover my changes.
• I have gone through all the steps, and have thoroughly read the instructions

[christianparpart]

LGTM. I trust you on this one. :-)