remove VS2013 build

5 jobs for master in 7 minutes and 21 seconds (queued for 1 second)
Status Name Job ID Coverage
  Test
passed clang-c++11 #100833
Linux

00:03:29

passed CoMISo-VS2017-Qt-5.10.1-x64 #100835
VS2017 IPOPT3129

00:01:20

passed gcc-c++11 #100832
Linux

00:07:20

passed macos-c++11 #100834
Apple

00:02:41

 
  Deploy
passed trigger_build #100836

00:00:01