Scripts (and scripting languages)

Looks like there are a few scripting languages used for various tasks:

```
$ find ChakraCore -name \*.bat -o -name \*.cmd -o -name \*.ps1 -o -name \*.py -o -name \*.pl -o -name \*.sh | grep -o "\(cmd\|ps1\|py\|pl\|sh\|bat\)" | sort | uniq -c
1 bat
26 cmd
3 pl
14 ps1
13 py
15 sh
```

One issue is that a number of those only run on Windows. Also there is probably no good reason to depend on Perl _and_ Python, and given that there are only three Perl scripts it probably makes sense to drop Perl altogether. It also makes sense to pythonise the scripts described in #6410 (same scripts as in #3330).