Update to 2.1.4

Changelog:

• Security: Fix XSS for pagination, when multi-category selection is used.
• Minor code fixes (proper PHP escaping for 'orderkey' SQL statement.
• Skeleton, Timeline and Clean Blog templates: Add theme option to disable google webfonts Link to https s9y.org pages.

Switch to mysqli PHP extension (Fixes build with PHP 7.x)

MFH: 2018Q3
Security: 01018916-c47c-11e8-8b07-00e04c1ea73d
Sponsored by: Netzkommune GmbH