IL2104: Assembly produced trim warnings

[hunterdyar]

Had an issue using this library, where it didn't subscribe to devices correctly - but only in a release build. I eventually noticed the "IL2104: Assembly produced trim warnings" message and learned it had to do with the "Trim Unused Assemblies" option, which I turned off as a workaround. Only tested on win-x86 target.

This Prepare Libraries For Trimming would be my starting point. Hopefully I'll be able to dig in later and submit a PR.

[thargy]

Thank you for looking into this and being willing to submit a PR. I am in teacher training as part of my retirement and am swamped with work, so I appreciate any contributions. I will try to review any PR promptly.

However, on brief glance, I suspect you're in for a world of disappointment. HIDDevices, by it's nature uses a lot of reflection and contains some weird and wonderful manipulations, that, on the face of it, don't seem that compatible with trimming!