* #mingw #cmake: rules for native and cross compilation
* #mingw #cmake: fix CMakeLists.txt for using with MinGW under Windows
* #mingw #cmake: fix typo (BUILD_ENV_WIN -> BUILD_ENV_MSVC)
* workaround for missing left button on osx
* change Qt path
* change CMake
* transfer filter's pointer to application directly
* rebase
* add final, delete virtual, and beautificate