`isAlNum` and `isAlpha`:
1. I think these names are a bit cryptic.
2. `isAlpha` is a bit ambiguous: is it alpha*numeric* or alpha*betic*?
This is why I renamed `isAlpha` to `isAlphabetic`.
3. For consistency and because `isAlNum` looks weird, I renamed it to `isAlphanumeric`.
`isCntrl`:
1. It's cryptic and hard to find when you look for it.
2. We don't save a lot of space writing it this way.
3. It's closer to the name of the `control_code` struct.
`isSpace`:
1. The name is ambiguous and misleading.
`spaces`:
1. Ditto
`isXDigit`:
1. The name is extremely cryptic.
2. The function is very hard to find by its name.
I think `isBlank` and `isWhitespace` are quite confusable.
What `isBlank` does is so simple that you can just do the `c == ' ' or c == '\t'`
check yourself but in a lot of cases you don't even want that.
`std.ascii` can't really know what you think "blank" means.
That's why I think it's better to remove it.
And again, it seems ambiguous considering that we have `isWhitespace`.
Next, it also deprecates `isGraph`.
It's the same as `isPrint(c) and c != ' '`, which I find confusing.
When something is printable, you can say it also has a *graph*ical representation.
Removing `isGraph` solves this possible confusion.
We already have a LICENSE file that covers the Zig Standard Library. We
no longer need to remind everyone that the license is MIT in every single
file.
Previously this was introduced to clarify the situation for a fork of
Zig that made Zig's LICENSE file harder to find, and replaced it with
their own license that required annual payments to their company.
However that fork now appears to be dead. So there is no need to
reinforce the copyright notice in every single file.
* Add an upper case variant of `allocLowerString`
* Add case-sensitive variants of `eqlIgnoreCase`, `indexOfIgnoreCase`,
and `indexOfIgnoreCasePos`
* Add and update docstrings on functions
