Refactor build.sh and package.sh into app.sh
Use HALCYON_FAKE_APP in a more regular way
Separate install_app out of halcyon_install
Improve notation
Separate upload_original out of download_original
Rename caching to archiving
Add option not to upload even if S3 is configured
Add option not to archive
Remove out-of-scope option
Move log_add_config_help to sandbox.sh
Add options not to use prebuilt packages
Rename cut to trim
Downgrade warnings about missing prebuilt packages
Rename silent to quiet
Relax HALCYON_PREBUILT_ONLY restriction