* #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)
* Remove license support, and old editions
Previously, old code to support various editions of Toonz, as well as
license activiation code, was cluttering the repository.
Support for LINETEST is retained.
* fix conflicts