Properly handle extension information and configuration in the init system

[CodingRays]

In the current init system extension support is still insufficient (see #6).
Specifically 2 major issues exist:

1. Extension information (for example features and properties if available) are not queried and provided by the init system.
2. Configuration of extension features is not possible at all. Currently hacks are in place for timeline semaphores and debug utils, however this is not a sustainable method.

A system properly handling these should be able to load all necessary extension information based on available extensions and provide a easy method for features to query and configure those. Due to the variation of extensions this might not be a trivial issue to solve.