Enforce use of an encoding/decoding key (TCK) in all Hlt encoders/decoders, do not use online-reserved bits in SourceID, remove explicit mention of 'packed' locations, enable 'stable' persist reco locations

See merge request !3528

Convert Condition to YAML on demand

Closes #241 and Moore#473

See merge request !3765

RICH SourceID - Add constructor from individual values

See merge request !3766

add Epos in CalculateEXY return

See merge request !3763

instead of making a YAML version at construction

- this allows all git interaction to be done in a single batch
- and allows configuring the GitANNSvc with overrules instead of writing
  to git
- and allows skipping _any_ writes to git
- also, add an 'alternative' RefFormatter to GitANNSvc which allows to
  eg. add key-specific tags such as key-0123abcd:ann/json/01/0123abcd as 'fallback'

Allow the use in Allen with minimal dependencies

- clone using ssh: instead of https: to make it easier to later push
- specify list of (repo,tag) combinations instead of single tag and list of repo
- replacey 'print' with 'log'

- store entries with a filename derived from their key instead
  of a generic filename, and using the key to look them up
- add support code to streamline downstream tests