Fixed sync issue when levelling through summons.

Normally synchronized events were marked synchronized even when nested in non-synced events.
  This is now fixed.
Raised lich attack AP cost to 4.

I never quite liked it as low as 3.
Removed mentor resistance bonus.

There was no balance reason for it (mentor is good already),
and the thematic reason for it has been very weak since it became a talent
   rather than an alliance - now only the alliances affect your stats.
And you can buff your resistances to 30% anyway with spell training.
added some debug sync checking to swarms
2.1.6.0: many balance changes and fixes
Greatly cheapened Fire Guardians
Fixed scenario-end events being marked synchronized when they are not.
Marked side_turn_end synchronized in 1.11, fixing Zombie Swarm errors there.
2.1.6.1: remove some error messages (and cheapen Fire Guardians)
fixed Energy Blast usually not recovering
Made cooler names for level-2+ mudcrawlers
fixed Energy Blast + CoP/Aegis interaction
Mud Touch no longer costs any mana
Tweaked settings rules to ensure Creep War defaults to RPG settings again
Fixed menu error for players with no wizard
Really fixed Energy Blast + CoP/Aegis interaction
Reduced Dispelling Touch mana cost
Fixed swarms not recovering from slowing
Fixed reanimating Liches.
Made stationary units' advancement more consistent