Add support for .yamltectureignore to --mergeConfig

[JaredHatfield]

By default the --mergeConfig combines all YAML files into a consolidated config file. However, it may be possible that you don't want all YAML files in that folder to be combined. That is where a .yamltectureignore file would come in useful. This file would contain a list of the files to be ignored by the command. This new file type should use the same syntax and approach of .gitignore files, just being used by the .yamltectureignore.