Adds Flame, Flame Assist and Flare to the default config.

This adds Flame, Flame Assist and Flare support to the default config:

- Desktop Launcher for flame and flame assist
- Shotgun Project level access to flame and flame assist
- Shell Project level access to flame and flame assist
- Shotgun Shot level access to flare
- Shell Shot level access to flare
- Added Flame and Flare engine with export and review apps
- Added new templates for flame plates
- Added loader support for flame plates in nuke (shot step context)