Move remains of common/sprite1.xml to common/common_sprites.xml.
Remove duplicates bkFillBlack and bkTranslucent.
Rename bkWhiteBorderBlack to BackgroundWhiteBorderBlack.
Move BackgroundSessionTooltip and BackgroundInformationTooltip to
session/.
Remove unused BackgroundErrorTooltip.
This was SVN commit r18636.
Adds hotkey.cancel mapped to the Escape key, which is now used for
closing/canceling in-game dialogs, fixes#2636, #3200. Please report any
dialogs where Esc doesn't work!
This was SVN commit r16736.