for all c++ header and source files, excluding the lib/ 3rd party headers, check if the license text comment in the beginning of the file exists twice - if so, remove the copy so that the license text exists only once

for all c++ header and source files, excluding the lib/ 3rd party headers, check if the license text comment in the beginning of the file exists twice - if so, remove the copy so that the license text exists only once #7