Dali::CalculateHash support to hashing raw-buffer

Dali::CalculateHash support to hashing raw-buffer

Current Dali::CalculateHash input std::string, but internally
convert as const char * string.
In this case, hashing calculation didn'w works well
when std::string contain \0 character middle of string.

This patch make one more API s.t. allow std::vector<std::uint8_t>
as input so we can specific the length of data what we want to hash.

It will be used in dali-toolkit texture-cache-manager in soon.

Change-Id: I5ceaeb0cbf1140729d1f0f68930c8cbcd8a18594
Signed-off-by: Eunki, Hong <eunkiki.hong@samsung.com>