Get rid of StSw craziness and use lsllastpass to make another pass.

This has been a TODO item for long. Now that we have lsllastpass, it's actually easy to implement.

Adds an LSLTypeDefaults dictionary to lslcommon, just in case the state-changing function returns a value and we need to insert a return statement.

We've also added subtree-local info to lsllastpass (lost when we return to the parent after visiting a subtree).

This fixes a bug where naked switch statements could appear as a result of optimization, and cause the compilation to fail.

lslopt/lslcommon.py

@@ -67,6 +67,10 @@ LSLType2Python = {'integer':int, 'float':float,
     'string':unicode, 'key':Key, 'vector':Vector,
     'rotation':Quaternion, 'list':list}
 
+LSLTypeDefaults = {'integer':0, 'float':0.0, 'string':u'', 'key':Key(u''),
+    'vector':Vector((0.,0.,0.)), 'rotation':Quaternion((0.,0.,0.,1.)),
+    'list':[]}
+
 def warning(txt):
     assert type(txt) == unicode
     sys.stderr.write(u"WARNING: " + txt + u"\n")