Add a `Builder::blacklist_type` method; deprecate `Builder::hide_type`

[fitzgen]

Currrently, the --blacklist-type flag's corresponding Builder method is Builder::hide_type.

The naming difference is unnecessary, inconsistent, makes it harder for users to switch from CLI to builder or vice versa, and adds one more thing to remember/know about the code base when developers are reading about hidden or blacklisted things.

We should:

• Add Builder::blacklist_type, that does the same thing as hide_type
• Mark Builder::hide_type as #[deprecated = "Use blacklist_type instead"]
• Make hide_type delegate to blacklist_type
• Rename the BindgenOptions::hidden_types member to BindgenOptions::blacklisted_types
• Rename ir::context::BindgenContext::hidden_by_name to blacklisted_by_name
• Rename ir::item::Item::is_hidden to is_blacklisted

[highfive]

Hi! If you have any questions regarding this issue, feel free to make a comment here, or ask it in the #servo channel in IRC.

If you intend to work on this issue, then add @highfive: assign me to your comment, and I'll assign this to you. 😄

[alexeyzab]

Hi! I'd like to try implementing this.

@highfive: assign me

[highfive]

Hey @alexeyzab! Thanks for your interest in working on this issue. It's now assigned to you!

[tamird]

fixed in #991

[fitzgen]

Thanks for the reminder, @tamird !

@alexeyzab, fwiw, if you add "Fixes #12345" in the git commit message, github will automatically close the issue once the relevant PR is merged.