1.2.1 Beta 1

Adds mod configuration options to specify the "arena" size around the altar of summoning.
Additional warning/error messages are shown to the player when the arena isn't flat nor solid enough.

Added two new options for boss/add configuration:
"spawnEffect": This can be either: "none" or "lightning". Default is "none". This determines the visual effects used when a monster is summoned.
"shouldSpawnInAir": When this is set to true; this will cause the monster to spawn at the top of the height of the "arena" (Mod Configuration) instead of at ground level.