[Issue 23707] New: File.rawRead/rawWrite should support reading/writing individual values

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23707

          Issue ID: 23707
           Summary: File.rawRead/rawWrite should support reading/writing
                    individual values
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: schveiguy at gmail.com

Sometimes, you just want to read a byte (or write one). Doing so with rawRead
or rawWrite is awkward, because first you have to declare a buffer, then use
the buffer, then convert to the place where you actually want to use it. A
3-statement process is pretty inconvenient.

However, what if rawRead/rawWrite could have overloads that deal with one item:

```d
T rawRead(T)() if (!isArray!T) {...}
void rawWrite(T)(in T item) if (!isArray!T) {...}
```

Or stdio could provide wrappers that do this, they don't have to be overloads.

Just some way to do in one line what it currently takes 3 lines to do.

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