Implement the support to t:removeComments into libmodsecurity

[zimmerle]

Transformation removeComments needs to be implemented inside libmodsecurity.

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

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

[zimmerle]

Closed at: b7e8226