use EMAMOpt2CPP instead of EMAM2CPP including bugfix for cmake order generation

2 jobs for use_math_opt_generator in 3 minutes and 31 seconds (queued for 1 second)
Status Name Job ID Coverage
  Windows
passed masterJobWindows #270920
Windows10

00:02:14

 
  Linux
passed BranchJobLinux #270921

00:01:16