Merge branch 'master' of https://github.com/fedetft/mxgui

Makefile

_examples/benchmark/Makefile

_examples/benchmark/benchmark.cpp

_examples/benchmark/benchmark.h

_examples/benchmark/checkpattern2.cpp

_examples/benchmark/checkpattern2.h

_examples/display_st7735/main.cpp

_examples/display_st7735/retargeted-display.cpp

_tools/code_generators/CMakeLists.txt

_tools/code_generators/libs/png++/ChangeLog

_tools/code_generators/libs/png++/Doxyfile

_tools/code_generators/libs/png++/Makefile

_tools/code_generators/libs/png++/NEWS

_tools/code_generators/libs/png++/common.mk

_tools/code_generators/libs/png++/config.hpp

_tools/code_generators/libs/png++/consumer.hpp

_tools/code_generators/libs/png++/convert_color_space.hpp

_tools/code_generators/libs/png++/error.hpp

_tools/code_generators/libs/png++/example/Makefile

_tools/code_generators/libs/png++/generator.hpp