Name refactoring: appliedValues -> loadedValues

Signed-off-by: Miguel M. Almeida <miguelcma@CMA-Retina.local>
Remove setSessionAttribute and setDeviceAttribute

Signed-off-by: Miguel M. Almeida <miguelcma@CMA-Retina.local>
Remve LiquidVariables.plist from repository

This file should be created by the developer.

Signed-off-by: Miguel M. Almeida <miguelcma@CMA-Retina.local>
Changes in default log/error messages

Signed-off-by: Miguel M. Almeida <miguelcma@CMA-Retina.local>
Remove setSessionAttribute and setDeviceAttribute

from Liquid.h header file

Signed-off-by: Miguel M. Almeida <miguelcma@CMA-Retina.local>