disable DGA mouse on Linux by default, and workaround SDL's alternative implementation not warping the mouse after grab. fixes #5
Fix system text refresh when scrolling left and right on a touchpad
Use left mouse button enum
Use SDL button names instead of numbers in MouseButtonEvent code
Merge remote-tracking branch 'robn/disable-linux-dga-mouse'
add extra issue ref to changelog
Merge remote-tracking branch 'bitplane/gui-fixes'
add availability codedoc to Game.StartGame, Game.LoadGame and Engine.Quit