Update pod settings to speed up build time on debug

Podfile

#
# 1. Enable build duration setting in Xcode from terminal:
#
#   defaults write com.apple.dt.Xcode ShowBuildOperationDuration YE
#
# 2. add a post-installation phase to the Podfile to change the Debug Information Format setting in all targets and Pods
#
post_install do |installer|
  puts("Update debug pod settings to speed up build time")
  Dir.glob(File.join("Pods", "**", "Pods*{debug,Private}.xcconfig")).each do |file|
    File.open(file, 'a') { |f| f.puts "\nDEBUG_INFORMATION_FORMAT = dwarf" }
  end
end
#
# from https://engineering.zalando.com/posts/2015/06/speeding-up-xcode-builds.html
#