implement CallMethod and Pop + lots of bugfixing
implement CallMethod and Pop + lots of bugfixing

after this commit, test/trace has 33/44 failures

freedesktop-unofficial-mirror/swfdec__swfdec,freedesktop-unofficial-mirror/swfdec__swfdec,freedesktop-unofficial-mirror/swfdec__swfdec,mltframework/swfdec,mltframework/swfdec