Tfblib examples on Tilck

Tilck fully supports Linux's framebuffer interface /dev/fb0 for user applications. Some nice and simple applications using it are the examples part of the tfblib library. Downloading it is simple as running:

./scripts/build_toolchain -s build_tfblib

Of course, re-running ./scripts/cmake_run and then make rem is mandatory after that in order to update the CMake project and to rebuild the image.