Rearrange source layout so that lossmin builds in two ways

lossmin now builds stand-alone using the CMake file in the top-level
lossmin directory (or the Python script and also
as part of the Cobalt build which includes the CMake file in
the second-level directory lossmin/lossmin. The source files
in lossmin refer to the lossmin header files via paths that
start with "lossmin". That is why we added an additional
directory layer.

Change-Id: Idb7ec11257751e008970a7f905d9eb6fd555bca3
16 files changed