0.8 Migration guide (#389)

## Objective

- Migration guide for 0.8

## Solution

- Create a new section for each PR tagged with `C-Breaking-Change`
	- Copy the Migration Guide from the PR if it exists
- Create a few more sections for PR not tagged with the label

## Notes

The ordering was pretty much whatever order github gave me when I searched breaking changes, so if you feel like something should be close to the top please notify me. For example, I moved the camera driven stuff at the top since it's probably going to be the biggest one

Co-authored-by: Charles <IceSentry@users.noreply.github.com>

Author: IceSentry