Implement the support to t:cmdLine into libmodsecurity

[zimmerle]

Transformation cmdLine needs to be implemented inside libmodsecurity.

The documentation of the transformation can be found here:
https://github.com/SpiderLabs/ModSecurity/wiki/Reference-Manual#cmdLine

The file already exist in the repository:
https://github.com/SpiderLabs/ModSecurity/blob/libmodsecurity/src/actions/transformations/cmd_line.cc

[zimmerle]

Feature added. c855291

[zimmerlezen]

Test cases at owasp-modsecurity/secrules-language-tests@8089e2e