Add stopCmd for custom stopping instructions (#136)

Allow configuration of how a model is stopped before swapping. Setting `cmdStop` in the configuration will override the default behaviour and enables better integration with other process/container managers like docker or podman.

proxy/config_windows_test.go

@@ -38,5 +38,4 @@ func TestConfig_SanitizeCommand(t *testing.T) {
 	args, err = SanitizeCommand("")
 	assert.Error(t, err)
 	assert.Nil(t, args)
-
 }