* Add method to convert values to ray or wad units
* Convert data to ray or wad for cat_file_chop_lump
* Use shared convert functions in price feed conversion
* Pull common ray/wad values into vars
* Fix after rebase with staging
- fetches logs from all three price feeds in one query
- assumes eth/usd price feed will be updated to include LogValue event
- updates transformers to run separate from header sync