Re-add CgreenValue tests for C++
Re-add CgreenValue tests for C++

cgreen-devs/cgreen,thoni56/cgreen,cgreen-devs/cgreen,thoni56/cgreen,thoni56/cgreen,cgreen-devs/cgreen,thoni56/cgreen,thoni56/cgreen,cgreen-devs/cgreen,cgreen-devs/cgreen