Project uses configuration files to now send in parameters instead of
defining parameters on the command line.

Also changed to have the configure file only build if it is not a
subproject. Otherwise the superproject will make sure to get the
configuration file and set the parameters.

Note that in current meson version that without an implementation of
`get_gen_dependency_args()` the nvcc compiler does not track
dependency changes (configuration parameter changes in the headers) and
so a recompiliation results in a partial target rebuild. This requires
the project be wiped or setup for a new build every time a configuration
is changed with something like `meson --reconfigure`