Allow copy-and-paste of various things, like the selected objects.

Probably implement by converting the data to XML and saving as text into the clipboard, so that people can easily edit it in a text editor or save it to disk and then copy it back into Atlas.

Create an object in Atlas. Zoom in and move the camera so the object is near a corner of the screen. With the object-move tool, click the unit and try moving by a single pixel. It jumps towards the edge of the screen by dozens of pixels.

It seems the cause is that CCamera::GetScreenCoordinates and CCamera::GetWorldCoordinates are not exact inverses - for points near the edge of the screen, the difference is quite significant. (GetWorldCoordinates requires integer pixel values, but I don't think that'd cause errors of more than one screen-space pixel (which would be acceptable) - it's probably some difference in the algorithms used to convert between spaces.)

We are currently using really hacky code in sound/ogghack.cpp to decode OGG for sending it to OpenAL.

Background: all of our sounds are in .ogg format. At one point it was promised by Creative that their Windows implementation would support an extension that allows passing in OGG data directly to OpenAL. This would be very convenient for us and also quite efficient. Unfortunately Creative dropped the ball - they never got it working and now officially say "do it yourself".

Since ogghack.cpp was implemented during the time when they promised the extension would be available soon, it is a very basic implementation, wasteful of memory, and doesn't check for errors. This should be cleaned up and made permanent.

No serious changes should be required; we can still use the OGG Vorbis library as currently.