Implemented optional object support to project:
CodeSharper/CodeSharper.Core/Common/Optional:
  - Implemented Optional(T) generic class
CodeSharper/CodeSharper.Core/Common/OptionalHelper:
  - Added helper class for Optional(T)
CodeSharper/CodeSharper.Tests.Core/Common/OptionalTestFixture:
  - Added test cases for Optional(T) class