Fix crashes

 Garbage collection works too good sometimes and data
 sent to opengl can be garbage collected before it is
 used in consecutiv calls.
 Specially now that a multithreaded emulator is used,
 and the calls to the driver are buffered until the
 gui thread is scheduled in.
 To be able keep the data alive we send it to another process,
 instead of keeping the transient data in some datastructures.
 Invoke release_all after each frame is drawn so we can release the data.

NOTE: Fix various crashes and instabilites.
Fixed freeze mirror for all exporters

It was not passing the "freezed" objects to the exporting routine of any plugin.

Also, it was removed the wpa:freeze call use in only two exports: yafray and hlines - not needed anymore.

NOTE: Automatically freeze mirrors when exporting, thanks to nemyax for the report.
Use unicode strings in Wings3d.exe

Erlang requires a unicode api since R16B

NOTE: Window can be used by users with unicode chars in the name on windows
Fixed an issue setting camera position with the dialog.

The Y value was not moving the camera top/dowm when the X and Z values
were zero.

NOTE: Fixed an issue setting the camera position with the dialog.
      Thanks to ekolis.
Update release notes
Fixed a crash when main window was maximized and there were plugins' window opened in the last wings session. Thanks Fonte Boa and Stem for report it. [Micheus]
Fixed povreay output formats

POV-Ray plugin was only output .png file when using the menu option Render. It was added the other file types supported by POV-Ray - the user can choose between them by using the "File type" dropbox in the Render dialog.

NOTE:
Fixed more PovRay output formats
Thanks ekolis.
Update release notes