Properly embed http links in haddock comments
Move all modules common to both client and server to Common/
Fix imports after the Common/ move
Differentiate messages for quit vs defeat/victory
Fix hidden door opening by adding auto-search when opening
Make secret tile more common now that searching is not a grind any more
Add some flavour to suspect walls
Fix AI trying to shoot its feet off
Make AlterTileA silent now that it's common

Initially it was supposed to be only digging, hence loud.
Now it's door opening and even searching, so it's too much noise.
Don't let unconscious actors move
Do not repeat the "falls down" message when unconscious actor hit again