Cache Hospitality reflections

[alattalatta]

Fixes #10

This PR works mostly by caching every reflection info for Hospitality within the patch class, reducing performance overheads. For the field access (CompGuest#bed), see https://stackoverflow.com/a/38538377.

Results

The very first patch call takes around 10ms, which is 97% reduction.

Any subsequent calls takes even less time, highest being 2ms, and average, less than 1ms.

Tests were done in a small scale, so it would be a good idea to test it on your side too.

[jptrrs]

Hey, this is great! Thanks! I'll incorporate it ASAP.