FIX: correct detecting if epoll() and eventfd() are supported on Linux.
REFACTOR: update comments.
REFACTOR: doc.
FIX: httpValidUriChars to permit %
FIX: case when URI contains invalid chars. Need to abort connection.
TEST: update unit tests for URI encoding based on new httpValidUriChars rejecting previously accepted requests.
TEST: Add test for HTML injection in URLs.
Revert "TEST: Add test for HTML injection in URLs."

This reverts commit b07ac8265504ea385d2f7da1ac94853e0897b25c.
TEST: Add test for HTML injection in URLs.
FEATURE: Add extraSecurity main.bit configuration option to enable extra security measures that have a performance (small) impact.