pstrBuffer method
Allocates a mutable ANSI string buffer (PSTR) with capacity for length
characters, including the terminating NUL character.
This is intended for Win32 APIs that write into caller-provided ANSI buffers.
The buffer is owned by the arena and freed automatically when the arena is disposed.
Implementation
PSTR pstrBuffer([int length = 1]) => .new(allocate<BYTE>(length).cast());