Rename CodePointSet to CodePointInversionList

[echeran]

Fixes #2225

[sffc]

Note that this may conflict with #2235; since @hsivonen is OOO, I would prefer if we merge #2235 first and then fix the merge conflict in this PR.

[sffc]

Nit: The properties API is no longer "TBA"; fix?

[echeran]

Done.

[sffc]

Suggestion: name this get_inversion_list_vec() since the type is now called an "inversion list" too

[echeran]

Done.

[sffc]

(setting review bit appropriately)

[sffc]

test-docs is unhappy

failures:

---- src/uniset.rs - uniset::CodePointInversionList::all (line 221) stdout ----
error[E0599]: no method named `get_inversion_list` found for struct `CodePointInversionList` in the current scope
 --> src/uniset.rs:226:42
  |
8 | assert_eq!(CodePointInversionList::all().get_inversion_list(), expected);
  |                                          ^^^^^^^^^^^^^^^^^^ help: there is an associated function with a similar name: `get_inversion_list_vec`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0599`.
Couldn't compile the test.
---- src/uniset.rs - uniset::CodePointInversionList::bmp (line 245) stdout ----
error[E0599]: no method named `get_inversion_list` found for struct `CodePointInversionList` in the current scope
  --> src/uniset.rs:252:42
   |
10 | assert_eq!(CodePointInversionList::bmp().get_inversion_list(), expected);
   |                                          ^^^^^^^^^^^^^^^^^^ help: there is an associated function with a similar name: `get_inversion_list_vec`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0599`.
Couldn't compile the test.

failures:
    src/uniset.rs - uniset::CodePointInversionList::all (line 221)
    src/uniset.rs - uniset::CodePointInversionList::bmp (line 245)

test result: FAILED. 30 passed; 2 failed; 0 ignored; 0 measured; 0 filtered out; finished in 6.10s