recording support: now available for dynamic collections via config
- config.yaml 'recorder: live' entry enables /record/ subpath which records to any dynamic collections (can record from any collection, though usually live)
- autoindex refactor: simplified, standalone AutoIndexer() -- indexes any changed warc files to autoindex.cdxj
- windows autoindex support: also check for changed file size, as last modified time may not be changing
- manager: remove autoindex, now part of main cli
- tests: updated test_auto_colls with autoindex changes
- tests: add record/replay tests for recording and replay
