glib: Bind g_unichar APIs

[RealKC]

I'm not sure if documentation for these methods can be automatically generated given these are manually defined as methods on an extension trait.

I think I got all of the ones not offered by the stdlib

Closes #763

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Some notes:

• names were made "rustier", e.g.: g_unichar_istitle became is_titlecase
• I did not include APIs that were already availabe through Rust's char

[RealKC]

Regarding the CI failures:

• can I tell typos to ignore either a specific file or specific line? I'd rather not ignore the paranthesis typo on the whole project (and where it is made, it is necessary)
• do I need to add doc aliases to the impls for the functions too of the trait too? Seems strange

[sdroege]

do I need to add doc aliases to the impls for the functions too of the trait too? Seems strange

You only need to add them on plain functions and trait declarations, not trait implementations.

can I tell typos to ignore either a specific file or specific line? I'd rather not ignore the paranthesis typo on the whole project (and where it is made, it is necessary)

Something for @bilelmoussaoui I guess :)

[RealKC]

Changes since last push:

• rebased on top of master
• addressed review comments

You only need to add them on plain functions and trait declarations, not trait implementations.

As far as I can tell, CI is now failing because the aliases don't exist in the trait impl

[RealKC]

I rewrote the trait so that CI would be happy, seems to have worked