WIP: first take at making it compile natively on windows

CMakeLists.txt

inc/lektor/config.h

inc/lektor/internal/os.h

inc/lektor/internal/win32/termios.h

inc/lektor/internal/worker.h

inc/lektor/net.h

src/base/cmd.c

src/base/commands.c

src/base/common.c

src/base/config.c

src/base/launch.c

src/base/logfile.c

src/base/os.c

src/base/segv.c

src/database/cache.c

src/main/lkt.c

src/main/luka.c

src/main/server.c

src/mkv/write.c

src/module/module_repo.c