Reduce the "griefness" of Truce

Truce changes:

1. Added same focus time as discord.
2. Added mana, reagent and vigor cost
- This is important I think to add a little balance to this really
powerful spell. You have a spell that stops all combat in a room dead
and doesn't have any focus time and quite cheap for its power.
Discordance has a focus timer and truce did not leads me to the opinion
it was incredibly un balanced. Now with a little extra cost - will make
people less likely and less able to cast it continuously.