Began backporting new program selection API to standalone.
Permit Boxer Standalone to open external gameboxes from the commandline, to simplify testing from XCode without needing to go through Boxer Bundler. Suppressed codesign-strip warnings when running Boxer standalone under Debug build configuration.
Fixed about 8 trillion compilation warnings under XCode 6.1. Also fixed nextResponder-related assertions caused by 10.10 SDK NSViewController behaviour changes.