AGOS: Update debug tables.
VOYEUR: Some cleanup related to the onOff and pick masks
VOYEUR: Fix memory leak when quitting in showTitleScreen()
VOYEUR: Invert check on getBoltGroup in getComputerBrush for consistency
AVALANCHE: Implement MainMenu::centre().

Also rework connected functions.
FULLPIPE: Implement sceneHandler18()
FULLPIPE: Implement sceneHandler19()
FULLPIPE: Enable scene18 and scene19
AGOS: Fix error when dumping all VGA scripts.
AGOS: Switch keyboard shortcuts for dumps, to help prevent future conflicts.
VOYEUR: Some renaming related to the computer buttons
VOYEUR: Remove _field26 from the event timer
Merge https://github.com/scummvm/scummvm