Added example to doc.
Started to implement libespm usage. Implementation is fairly hacky, with global common options handling and compiling it with LOOT instead of as a separate library. As a consequence of performance being much better than anticipated, the whole caching and sharing of plugin data idea has been scrapped, since it's no longer worth the effort of implementing. Also some YAML emitter fixes, general cleanup.
Forgot to actually stage changes for last commit...