GameDB / Memcards - Replace yaml-cpp with rapidyaml

[xTVaser]

Description of Changes

• Replaces our YAML library with rapidyaml, a significantly faster and more actively maintained library without by-design memory leaks (to my knowledge)
  • it is MIT licensed, and it's dependencies are: MIT / Boost / Apache / BSD-2 Clause
  • it does have a slightly more tricky to use API and you must be a lot more strict (yaml-cpp let you get away with a lot of unsafe behaviour after going through this migration...) but it has significant documentation and examples.
• folder memory cards was the only other user of YAML, so I also had to migrate that

Rationale behind Changes

• rapidyaml is a better library, I wanted to do this from the start a year ago, but getting it working with our visual studio configuration at the time was the main blocker.
  • from 300-400ms to 30-40ms loading the GameDB

Suggested Testing Steps

• Thoroughly test folder memory cards and that i didn't break anything
• GameDB testing:
  • are speedhacks/gamefixes/memcard filters/patches loaded as expected?
  • if you have invalid yaml does the app catastrophically fail or gracefully continue (in Release mode! debug mode will hit assertions)

[TellowKrinkle]

Isn't this called split in pretty much every other language's stdlib?

[TellowKrinkle]

This is already the result of calling the default constructor. IMO it looks nicer to not have these.