[BUG] Inconsistent escaping behavior

[ptrckbp]

Describe the bug Images content escapes variables by default, and text doesn't. There doesn't seem to be any warning of this anywhere.

The solution to have the image display is including triple braces. I just guessed it would work from my experience and it did.

To Reproduce Steps to reproduce the behavior:

1. Go to flows
2. Create a node
3. Get the url of an image (like this one)
4. setVariable temp.url that url
5. create an image action, with the image field set to {{url}}
6. create a text action, with the text field set to {{url}}
7. try it out in the emulator. The image shouldn't appear, unless you use triple braces {{{ }}}

Expected behavior There should at least be a warning in the image content (and any other content where this might be a problem). Also, the behavior of the title is also escaped, even though it's similar to a text field. Otherwise, the notation should be standard ({{escaped}} {{{unescaped}}}), although I realize that change would be a lot more costly.

Environment (please complete the following information):

• OS: macOS
• Browser Chrome
• Browser Version Version 92.0.4515.131 (Official Build) (x86_64)
• Botpress Version 12.25.0
• NodeJS 12.13.0

Additional context

Related to https://github.com/botpress/v12/issues/191

[ptrckbp]

Another point : This doesn't mention anything about triple braces, but, maybe it could be mentioned in the popup, if we are going that way.