Preparing for version 2

[williamrowell]

• tabs -> spaces
• populate meta and parameter_meta
• standardize input and output names
• flatten inputs and outputs by removing IndexData objects
• refactor many HiFi-human-WGS-WDL tasks into wdl-common tasks
• add gpu support for DeepVariant call_variants
• add stats outputs to many tasks
• ReferenceData struct replaced by ref_map_file, simplifying inputs
• Tertiary Analysis related inputs replaced by tertary_map_file, simplifying inputs
• high level statistics directly exposed from many tasks
• many tool versions updated