* Remove 3D mode. Goodbye 3D mode
* Time control is now a per-player limit, rather than a max duration
* Fix undo before engine moves
* Fix engine desync when browsing history on engine's turn
* Do not enable pause action when browsing history
* Fix clock unpausing after game is over in rare situations
* Return view to present when engine moves
* Reword some error messages
* Shorten some window subtitles
* Add command line warning when engine makes illegal move
* Do not try to stop the game twice when an engine error occurs
* Ensure new game button is always sensitive when on game over
* Update header bar title when using Undo
* Workaround Vala signal misfires that could cause a rare crash
* Use header bar on promotion dialog
* Pause overlay is now transparent (but pieces are hidden)
* Minor improvements to preferences dialog
* Set bigger minimum size for chess board
* Miscellaneous code improvements
* Many updated translations
