Not bothering with export at the moment
AIXML"Stream" wasn't even using its stream in its constructor...
Someone clearly hadn't been using ACTUAL C++ for longer than C++'s existence like was claimed
...but then, that's literally impossible, so what could we expect...
And dear lord please stop throwing in constructors...
There are so many better ways to do this...
This use of throwing is why people dislike goto
It's hard to follow flow control that would be better done another way...
One day I'll fix it so it is, until then meh.
Rips out AIFile, since nothing is actually using it anymore and GPL code needs purged.
In order to remove code duplication, and as prove of concept,
I redid the linden_genepool archetype export and import (from the Edit
Appearance Floater), using AIXML and AIAlert.
The import/export code did shrink significantly, and became a lot
simpler. Although a new file pair (aixmllindengenepool.{cpp,h}) is
added to define the (de)serialization of the linden_genepool XML format,
that code is now centralized in one place, and still a lot simpler.
As a bonus however, every possible error is now semi-automatically
reported to the user with all details that might help to overcome
the problem, like file names and system errors.
