SotBE S18: fix coordinates of fake unit move

... to end where the unit appears.
SotBE S18: make Shan Taum's move contiguous

It didn't save much time to skip part of it and looked strange.
SotBE S18: use simpler and more robust check for afternoon time

This one will also happen in the afternoon if the scenario start time
of day gets changed.
SotBE S18: make Shan Taum death dialog work even if ...

... Kapou'e kills him himself.
SotBE S18: move images in some messages to the right

... so that they don't cover the speakers.