This is a new implementation of the JSON dumping which was already
proposed in #22 but this version tries to allow implementing both
reading and writing JSON files without having to change the existing
code too much. This is done by using an abstract class to hide the
differences between writing the JSON and binary files.
This is currently only capable of writing the files but not reading them
so if the option is enabled all changes to the pilot file are lost. I
will implement reading after this PR has been merged since I would like
to reduce the amount of changes that need to be reviewed.
