Ghost duration cut to 3 minutes

Logoff ghosts are a very contentious mechanic. This is a tentative first
step to see how combat evolves with shorter ghosts - all other arguments
aside, 10 minutes is way too long.
Created setting for adjustable ghost time
Fix some typos
Merge pull request #152 from M59Gar/ghosts

Ghost duration changed to a setting.
thrashers truce bug fix

Thrashers were still able to do their special spin attack with truce up
because of the flag change.
Statue Annoyance Fix

Per much player request, changed living statues' wake up chance to 100%
instead of 70%.

Seriously, why would they do this to us? Waiting for statues to wake up
is the worst. Fail a few rolls and you can be sitting idle on the same
statue for 10 minutes or more. I see no reason to keep normal statues
this way, but if admins want to do something for an event with it, the
code is still there.
Merge pull request #153 from M59Gar/thrasher

Thrashers truce bug fix
Merge pull request #154 from M59Gar/statues2

Statue Annoyance Fix
Add platform define for Windows