-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.
Allow for setting rendering thread priorities from the command line and final render dialog. Currently only implemented on Windows.
Show estimated time left on the final render dialog.
Sort palette list by name, instead of by index in the palette file.
Sorting can be flipped by clicking the column headers of the palette table.
--Code changes
Remove unnecessary connect() statement in Variations tab.
This avoids clang error in release mode: atom not found in symbolIndex(__ZN7EmberNs11EmberReport23StaticErrorReportStringERKNSt3__16vectorINS1_12basic_stringIcNS1_11char_traitsIcEENS1_9allocatorIcEEEENS6_IS8_EEEE) for architecture x86_64
