Rewrite SysConf handling

This rewrites the SysConf code for several reasons:

* Modernising the SysConf class. The naming was entirely cleaned up.
  constexpr for constants.

* Exposing less stuff in the header.

* Probably less efficient parsing and writing logic, but much simpler
  to understand and use in my opinion. No more hardcoded offsets.
  No more duplicated code for the initial SYSCONF generation.

* More flexibility. It is now possible to add and remove entries,
  since we rebuild the file. This allows us to stop spamming
  "section not found" panic alerts; we can now use and insert
  default entries.

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