More specific feature flags

[rster2002]

This PR adds some additional feature flags which allows users to fine-tune the library to their liking. For example if you only need ship models or exobiology predictions you can only enable those features without having to have logs enabled, which should hopefully also help with compile times.

Flags to add:

• Flag for logs module
• Flag for journal module
• Flag for state module
• Flag for json-models, which includes status and outfitting modules etc.
• Flags for exobiology data, so for example the spawn conditions and prediction logic and in the future also a flag for ship data.
• If the code allows for it, maybe even split the models into different feature flags, so you can for example only enable the ship models (and any dependent models) so you can have a very minimal library.