Fixed respawn bug in AI_BALANCER + Scheduler bug

AI_BALANCER respawns back the AI. Bug was in the FSM. In a transition,
when states are the same, the events SHOULD execute.
Added spawn delay interval option API SetSpawnInterval().
Bug that prevented AI_BALANCER to start if multiple AI_BALANCERs is also
fixed.
Fixed bug in scheduler dispatcher. Multiple schedules for the same
scheduler work now too!

Moose Test Missions/AIB - AI Balancing/AIB-004 - Respawn Test when Destroyed/AIB-004 - Respawn Test when Destroyed.lua

@@ -0,0 +1,46 @@
+-- Name: Respawn Test when Destroyed
+-- Author: FlightControl
+-- Date Created: 7 January 2017
+--
+-- # Situation:
+--
+-- For the red coalition, 2 client slots are foreseen.
+-- For those players that have not joined the mission, red AI is spawned.
+-- The red AI should start patrolling an area.
+--
+-- The blue side has SAMs nearby.
+-- Once the red AI takes off, the red AI is attacked by the blue SAMs.
+-- Red AI should be killed and once that happens, a Respawn of the group should happen!
+-- The Respawn happens through the InitCleanUp() API of SPAWN.
+-- 
+-- # Test cases:
+-- 
+-- 1. If no player is logging into the red slots, 2 red AI planes should be alive.
+-- 2. If a player joins one red slot, one red AI plane should return to the nearest home base.
+-- 3. If two players join the red slots, no AI plane should be spawned, and all airborne AI planes should return to the nearest home base.
+-- 4. Monitor that once a red AI is destroyed, that it ReSpawns...
+-- 
+
+-- Define the SET of CLIENTs from the red coalition. This SET is filled during startup.
+local RU_PlanesClientSet = SET_CLIENT:New():FilterCountries( "RUSSIA" ):FilterCategories( "plane" ):FilterStart()
+
+-- Define the SPAWN object for the red AI plane template.
+-- We use InitCleanUp to check every 20 seconds, if there are no planes blocked at the airbase, waithing for take-off.
+-- If a blocked plane exists, this red plane will be ReSpawned.
+local RU_PlanesSpawn = SPAWN:New( "AI RU" ):InitCleanUp( 20 )
+
+-- Start the AI_BALANCER, using the SET of red CLIENTs, and the SPAWN object as a parameter.
+local RU_AI_Balancer = AI_BALANCER:New( RU_PlanesClientSet, RU_PlanesSpawn )
+
+function RU_AI_Balancer:OnAfterSpawned( SetGroup, From, Event, To, AIGroup )
+
+  local PatrolZoneGroup = GROUP:FindByName( "PatrolZone" )
+  local PatrolZone = ZONE_POLYGON:New( "PatrolZone", PatrolZoneGroup )
+
+
+  local Patrol = AI_PATROLZONE:New( PatrolZone, 3000, 6000, 400, 600 )
+  Patrol:ManageFuel( 0.2, 60 )
+  Patrol:SetControllable( AIGroup )
+  Patrol:__Start( 5 )
+ 
+end