- Fixed bugs in AVISaveOptions dialog handling.
- Fixed bug in AVIFILE_LoadFile -- now check for more than
  MAX_AVISTREAMS streams in file.
- Implemented AVIMakeFileFromStreams and AVISaveVA method.
- Added IAVIEditStream interface.
- Implemented EditStream* methods.
- Added stubs for AVISaveVW, CreateEditableStream.
- Added stubs for clipboard handling.