Support case insensitive LinkType name in Feature creation

[achilleas-k]

Note by @hkchekc on specifying LinkType in Feature creation after switching to Enums: #395 (comment)

@gicmo while the idea is great and being merged, I just want to note that the by-product (supporting old strings) is not going to work (at least not completely). In the past, the string 'Tagged' with the first letter capitalized works. Now the valid string parameter input should be all lower-case. For example, 'tagged'

Ah true, I guess for that a .lower() call would need to be added now. I have no strong opinion about supporting it (or not). @jgrewe what do you think?

Originally posted by @gicmo in #395 (comment)

[achilleas-k]

Agreement by @jgrewe in #395 (comment)

[jgrewe]

Relates to all other Enums as well, does it not?

[achilleas-k]

Relates to all other Enums as well, does it not?

The only other new Enum is DimensionType and that was never directly set by the user, so the values never appeared in any other form.

[hkchekc]

Relates to all other Enums as well, does it not?

The only other new Enum is DimensionType and that was never directly set by the user, so the values never appeared in any other form.

Should we disable or make the dimension_type setter private?

[achilleas-k]

I think we should make it private.