Add generic-array and vecarray support (#134)

* Add generic-array support

* Add vecarray support

* Use 0.12 version of generic-array

* Update cargo lock

* Move impl to separate files

* Make sure std features of vecarray are disabled by default

* Use with_capacity

* Add features to CI

* Add missing license

* Add tests for generic-array

* Add tests for vec-array

* Apply suggestions from code review
7 jobs for parity-scale-codec-v1.0.2 in 12 minutes and 52 seconds (queued for 1 second)
latest