Various fixes + additional traits + optimisations

Added scripts to automatically update version information.
Added ETL version information to etl::traits.
Small optimisations for computing indexes for queues & cyclic_value.
#530 Fixed: etl::nth_type not implemented correctly.
#521 CMake: Add package version file for installation.
#525 Fixed: cplusplus constant type.
#517 Fixed: unused-local-typedefs warning.