[Rpm-maint] [rpm-software-management/rpm] Implement simple macro objects (PR #1826)

[Michael Schroeder]

Or:
```
%define colors[array]
```

I've also created an alternative  implementation that uses real lua objects. It works like this:
```
%define luamethod.Array._init { self:push(arg) }
%define luamethod.Array.push { for _,v in ipairs(arg) do ; table.insert(self, v) ; end }
%define luamethod.Array._expand { print(table.concat(self, " ")) }
```
The special `luamethod.` prefix tells %define that this defines a class method. That way the definition can also be in the macros file:
```
%luamethod.Array._init { self:push(arg) }
...
```

As with the other implementation, you can then do:
```
%defineobject foo(Array) first second
%{foo push bar}
%{foo push baz}
%foo
```
and get `first second bar baz`.

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