opal/core: simplify pack 'H*' implementation
opal/core: simplify pack 'H*' implementation

Instead of generating the hash at runtime, embed it into the script.
Avoid doing the to_chr conversion by using pack 'C*'.  Finally, use
Enumerable#each_slice, which does exactly what we want, instead of
trying to implement it ourselves.

Signed-off-by: brian m. carlson <738bdd359be778fee9f0fc4e2934ad72f436ceda@crustytoothpaste.net>

bk2204/daniel-ruby,bk2204/daniel-ruby