Patch AIXML to work now for import

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.

indra/llxml/CMakeLists.txt

@@ -13,7 +13,7 @@ include_directories(
     )
 
 set(llxml_SOURCE_FILES
-    #aixml.cpp
+    aixml.cpp
     llcontrol.cpp
     llxmlnode.cpp
     llxmlparser.cpp
@@ -23,7 +23,7 @@ set(llxml_SOURCE_FILES
 set(llxml_HEADER_FILES
     CMakeLists.txt
 
-    #aixml.h
+    aixml.h
     llcontrol.h
     llcontrolgroupreader.h
     llxmlnode.h