Renames "isActive" on spawnareas to "isSpawning" - so that a spawn area can be non-spawning but still have monsters left in it.
Adds new scripteffect types:
* "spawnAll" = sets spawn area to spawning and spawns all monsters
* "removeSpawnArea" = sets a spawn area to non-spawning and removes all mobs
* "deactivateSpawnArea" = sets a spawn area to non-spawning
* "activateMapChangeArea" = sets a mapchange area to non-active
* "deactivateMapChangeArea" = sets a mapchange area to non-active (so that it does not teleport the player)
Adds new property "active" to spawn- and mapchange areas in tmx files, that determines whether the areas are active when starting a new game.
* Requirement class moved from model.conversation to model.script
* Added requirement questLatestProgress : quest stage must be reached, but no stage with superior ID must be reached.
* New key requirements conditions type (item/gold/bonemeals) consumption (more or less than value, never strict checking, either <= or >=).
