FULLPIPE: Implement ModalSaveGame::handleMessage()
FULLPIPE: Implement ModalSaveGame::update()
MADS: Fix a crash when trying to pick up objects that can't be picked
MADS: Fix a bug in scene 102
MADS: Check for sane object IDs when checking for inventory objects

This avoids crashes in cases where the default excuse is shown, for
objects that can't be operated
MADS: Implement scene 402
MADS: Fixes for using items on other items
MADS: Further fix for using items on objects
FULLPIPE: Implement ModalSaveGame::saveload()
FULLPIPE: Implement ModalSaveGame::getFileInfo() and stubbed saveload support
FULLPIPE: Implement MctlCompound::removeObject()
FULLPIPE: Implement MctlCompound::replaceNodeX()
MADS: Implement scene 405
FULLPIPE: Implement MovGraphLink::~MovGraphLink()
MADS: Default game to impossible difficulty by default
MADS: Fix actions being triggered at the end of animation sequences
MADS: Add scene 406
MADS: Implement scene 407
MADS: Implement scene 408
MADS: Implement scene 410