-Add variations filter/selection dialog.
--Bug fixes
-Fix summary window not properly indicating the presence of pose affine.
-Remove a file named Fractorium.aps which had been erroneously committed a year ago.
--Code changes
-Use qobject_cast instead of dynamic_cast where appropriate.
-Add more override keyword where appropriate.
-Add variations list to settings for filter dialog.
Add the ability to apply operations to a selection of xforms, rather than just the current one.
Update tool tips accordingly.
--Bug fixes
Fix NAN in equalized weight calculation when all weights are set to 0.
--Code changes
Clean up strange nested usage of Update([&]()) calls when changing xform color index via either the spinner or scroll bar. Made no sense.
Make ISAAC RandBit() use RandByte() to be slightly more efficient.
Put FillXforms() in the controller where it belongs, rather than the main window class.
Add UpdateXform() function to the controller to handle applying operations to multiple xforms.
Remove the word "Current" out of most xform related functions because they now operate on whatever is selected.
Properly use Update() for various xform operations whereas before it was manually calling UpdateRender().
Also properly use Update() in places where it was erroneously using UpdateXform() for things that did not involve xforms.
Block signals in FillXaosTable().
Add new file named FractoriumXformsSelect.cpp to handle new xform selection code.
