Kotlin files are added to compile phase

[kpgalligan]

Kotlin files are added as compile targets. We can turn that off and only the file to the group, but breakpoints don't work.

Xcode doesn't attempt to compile Kotlin, so it doesn't impact functionality. However, there's a warning.

warning: no rule to process file 'xxx' of type 'text' for architecture 'x86_64' (in target 'yyy')

We should either figure out how to avoid adding files to compile, or a way to disable the error.