Option to store config file in project/IDE

[PhilipDukhov]

First of all, thank for a great plugin!

When I modified config, a CamelCaseConfigNew.xml file has been created in my project .idea directory. I can add it to .gitignore, but I'd prefer to have an option to save it as default for all projects. Same as I can do with code style config - so in each project I should be able to select to use IDE config or project one.