Refactor copying of build files to be much simpler and built in a way that can be shared between the setup and update tasks.
Switch build_settings to a multi-line string, which allows proper formatting of settings including quotes.
Simplify construction of modified xcode options hash.
Add --conf/--build_configuration option to frank build.
Moved frankify to helper method and added --conf/--build_configuration option to frank update (to ensure xcodeproj is correctly updated).
Modify frank build to also frankify the target if enough information is provided - avoids build failures after a configuration change.