Add: lines-are-beautiful (#6784)
Add: lines-are-beautiful (#6784)

Adds the C++ File API library "lines-are-beautiful" for the
reMarkable e-ink tablet.
LLNL/spack,tmerrick1/spack,matthiasdiener/spack,krafczyk/spack,krafczyk/spack,iulian787/spack,matthiasdiener/spack,mfherbst/spack,krafczyk/spack,mfherbst/spack,EmreAtes/spack,EmreAtes/spack,iulian787/spack,tmerrick1/spack,matthiasdiener/spack,iulian787/spack,krafczyk/spack,iulian787/spack,EmreAtes/spack,mfherbst/spack,EmreAtes/spack,iulian787/spack,LLNL/spack,LLNL/spack,tmerrick1/spack,mfherbst/spack,tmerrick1/spack,matthiasdiener/spack,krafczyk/spack,LLNL/spack,mfherbst/spack,LLNL/spack,matthiasdiener/spack,tmerrick1/spack,EmreAtes/spack