qr-code-generator-cpp: add package (#2530)
* qr-code-generator: add package
* Using io.write for xmake.lua file
* Remove set_kind
* Add config to set language of test to cxx11
* rename package to qr-code-generator-cpp
* move package to qr-code-generator-cpp
Improve quickcpplib (#1656)
* Improve quickcpplib
Convert quickcpplib to XMake
* Fix test on clang
* Use io.writefile instead of a file
* Fix test on clang
* Add missing header files