Change MELD graph traversal key names blackList/whiteList

[gklyne]

Changing names of blackList/whiteList in meld core codebase  (dev branch), as these have unfortunate connotations for some.

E.g. use:

Plan:

• propose new names; e.g. followProperties / ignoreProperties
• discuss new name choices with team
• apply name changes to codebase
• see if anything breaks

Ideally, this would be done with a test suite in place, but discussions indicate that the name change needs to be done sooner rather than later, so we may just have to push ahead.

[gklyne]

I'm proposing the following name changes:

- objectPrefixWhitelist    -> expandObjectPrefix
- objectUriWhitelist       -> expandObjectUri
- objectTypeWhitelist      -> expandObjectType
- objectPrefixBlacklist    -> ignoreObjectPrefix
- objectUriBlacklist       -> ignoreObjectUri
- objectTypeBlacklist      -> ignoreObjectType
- propertyPrefixWhitelist  -> followPropertyPrefix
- propertyUriWhitelist     -> followPropertyUri
- propertyPrefixBlacklist  -> ignorePpropertyPrefix
- propertyUriBlacklist     -> ignorePropertyUri 

[gklyne]

Comment received from @musicog (via Slack):

I would be careful with "expand" since its meaning is overloaded in jsonld-world. Maybe "include"? "fetch"? (both of those are overloaded in more general javascript as well, of course...)

[gklyne]

Proposing "extend" instead of "expand".

(Work-in-progress PR at oerc-music/meld-clients-core#16)