IBM Watson assistant integration
This branch will add IBM Watson assistant to character augmentation. The IBM credential file will be created at runtime in persistentDataPath (Will be deleted again when the user close the app). In manual builds, This file will be filled with the data from a txt file in Asstets/Resources which is excluded by gitignore, however it will be shared with other developers. In pipeline build, the pipeline will create the txt file in Assets/Resources when will build the app. The data of this file is defined on CI variables.
Closes #611 (closed) #610 (closed) #176 (closed) #609 (closed)