Switched from Thymeleaf to Jade.
Jade is much clearer to understand and less redundant than HTML. Additionally, Thymeleaf syntax was verbose in some places and it generally did not make a good impression. Quick performance tests (by no means hard evidence) suggested that Thymeleaf is slower than Jade4j as well. All in all, Jade seems to be a better choice than Thymeleaf and in such an early development stage, it is luckily still possible to switch a core component of the engine without breaking a massive amount of dependent code.
The Collap class is not a singleton anymore, and instead passed as a reference to each plugin.
Removed the obsolete Config class.