libctemplate: bump version to 2.3

Fixes some C++11 issues.
libtidy: new package

A library and CLI to validate, correct, and pretty-print HTML files.
libuchardet: new package

Yet another C wrapper for Mozilla's Universal Charset Detector C++ API.
libetpan: bump version up to 1.6
mailcore2: new package

MailCore 2 provides a simple and asynchronous API to work with e-mail
protocols IMAP, POP and SMTP.

Closes #5430