Add mirror camera checkbox option

[dceejay]

• [ ] Bugfix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)

Proposed changes

This adds a checkbox option to flip/mirror the camera. Current default is to have it set to mirror so when sitting in front of the camera it moves the "right" way... This option lets you turn that off so it behave the "normal" way. Default is still on.

Checklist

• [x] I have read the contribution guidelines
• [ ] For non-bugfix PRs, I have discussed this change on the forum/slack team.
• [x] I have run grunt to verify the unit tests pass
• [ ] I have added suitable unit tests to cover the new/changed functionality