nppDebug Func Guards: accept multiple guard categories in a scope.

I have notes that at one point, I'm not quite sure of when, we had the ability to call funcguard in a fashion similar to:

void foo()
{
    // foo and bar are different func guard categories.
    func_guard(foo|bar);
}

Yet, this method of calling was lost since that point.

This can create an issue with expected results of using guard_debugf_cat with different categories than the one placed in the funcguard() call.

void foo()
{
    func_guard(foo);
    guard_debugf_cat(bar, "cat bar output")
}

If foo & bar are enabled the output is as expected, and if foo is enabled and bar disabled the output is as expected, but if foo is disabled and bar enabled output is not as expected. Since NppDebug's printf will first check the bar cat, and then the FuncGuard state, which when disabled loses the indent level.

That isn't much of an issue, but imagine that the someone enables the Bar cat knowing a common function of Foo and Bar has a debugf_cat call, and knowing that enabling Foo is too much noise.

A brief discussion on notepad++ (log) showed that not only might I might have been wrong in my old notes, but also that it would be nice to have the funcguard accept variadic input.

This ticket item is opened for finding and implementing a method of doing this.

As func-guard capability is a fairly major part of 2.0 and I had already thought that the capability existed to do multiple categories I'd like this to be considered as an addendum to add expected behavior to the previous Func-Guard branches that have been merged into master.