RegNotifyChangeKeyValue isn't supported in the crate

[shacharrozin2]

MSDN documentation for this:
https://learn.microsoft.com/en-us/windows/win32/api/winreg/nf-winreg-regnotifychangekeyvalue

Can be wrapped with something list: (possibly in reg_key.rs)

use std::ptr;
use winapi::um::winreg::RegNotifyChangeKeyValue;
use winapi::um::winnt::HKEY;

pub enum NotifyFilter {
Name = winapi::um::winnt::REG_NOTIFY_CHANGE_NAME,
Attributes = winapi::um::winnt::REG_NOTIFY_CHANGE_ATTRIBUTES,
LastSet = winapi::um::winnt::REG_NOTIFY_CHANGE_LAST_SET,
Security = winapi::um::winnt::REG_NOTIFY_CHANGE_SECURITY,
}

fn notify_change_key_value(watch_subtree: bool, dwNotifyFilter: NotifyFilter, fAsynchronous:bool)
unsafe {
RegNotifyChangeKeyValue(self.hkey, watch_subtree, dwNotifyFilter as uint32, ptr::null_mut(), fAsynchronous);
}