IVGCVSW-5284 Refactor ExecuteNetwork

IVGCVSW-5284 Refactor ExecuteNetwork

 * Removed boost program options and replaced it with cxxopts
 * Unified adding, parsing and validation of program options
   into the struct ProgramOptions
 * Program options are now parsed directly into ExecuteNetworkParams
   which can be passed directly to MainImpl
 * Split NetworkExecutionUtils into header and source
 * Removed RunTest
 * Removed RunCsvTest
 * Removed RunClTuning
 * Moved MainImpl back to ExecuteNetwork.cpp
 * Added additional util functions
The functionality of ExecuteNetwork remains the same. Only
cl tuning runs need to be started separately
and there is no short option for fp16-turbo-mode because -h is
reserved in cxxopts to print help messages

Signed-off-by: Jan Eilers <jan.eilers@arm.com>
Change-Id: Ib9689375c81e1a184c17bb3ea66c3550430bbe09