Big update: packages, support of new releases, cron-scripts and more.
Changes:
- Fixes for empty mail headers, double newlines
- Updated php53-modset script – build info (-b), disable cron-scripts
- Updates cron-scripts, used php53 itself
- Updated build and package deps, use simple sendmail by default
- Updated paths to libexpat, use libxmlrpc-epi for xmlrpc module
- Used backported library libicu >= 56.1 to manage currency symbols right way
- Support Ubuntu 20, Debian 10
- Build with LTO for Ubuntu 14+, Debian 8+
- End support of Ubuntu 10
