A bunch of Improvements / Refactoring

[CyborgMaster]

I had need of a tool like this and built on what you started. I've extended what you had with a couple features:

• Interacting with stdin and stout instead of hardcoded file paths
• HID Usage Pages in their own files instead of one big file
• Outputting Usages in hex instead of decimal numbers to better match the docs
• Updating the enum names to match the ones from the official docs and official HID windows descriptor tool
• Printing the length in hex both normal order and byte reversed for easier inclusion in USB little endian communication.

And probably some other stuff.

It is a big rework of what you've done, so no need to accept this PR if this takes the tool in a direction you weren't planning on going in, but I thought I'd offer the improvements in case you were interested.

Let me know if you have any questions/comments and thanks for starting the tool, it was a big leg up getting the functionality I needed.

[beantowel]

import these files explicitly is better?

[beantowel]

remove before pull request