Clang Format 14 support

[alexei-spitfire]

Hi, thanks for this very useful tool!

I'm trying to use SpaceBeforeParensOptions in my custom format file, which is essential if I want to abide by JUCE coding standards. But Xcode tells me:

Could not parse custom style: Invalid argument.

I assume this is because Clang Format 14 is not supported. Are there any plans to implement this? Is it just a matter of getting this to compile with v14?