Implement C++ wrapper for LSError

:Release Notes:
Create directory structure for C++ wrapper.

:Detailed Notes:
Implement LS::Error.
Implement unit tests for LS::Error.

:Testing Performed:
Build + unit tests

:QA Notes:

:Issues Addressed:
[BHV-1535] Investigate existing wrappers

Open-webOS-DCO-1.0-Signed-off-by: Anatolii Sakhnik <anatolii.sakhnik@lge.com>

Change-Id: I9172a9a3400be1fc3ac7e00c9dfe44b8709a67f6
Reviewed-on: https://g2g.palm.com/5030
Reviewed-by: DCO Verification
Reviewed-by: Anatolii Sakhnik <anatolii.sakhnik@lge.com>
Tested-by: Anatolii Sakhnik <anatolii.sakhnik@lge.com>
Reviewed-by: Nikolay Orliuk <nikolay.orliuk@lge.com>