Dedicated syntax highlighting server for cgit. Use a simple HTTP server to highlight source for cgit. Improves performance compared to invoking python on every request. Requirements: - Python 3.5.3 (for aiohttp and asyncio.get_running_loop) - aiohttp - pygments Usage: 1. Run `make install`. 2. Configure your system to run /usr/lib/cgit/syntax-highlighting-server.py at boot. This can be done by `systemctl enable syntax-highlighting` on systemd machines. 3. Set your cgit source filter to syntax-highlighting-client.sh.