New Features:

Added options:
- nearby-entity-limit - changes nearby entity limit when spawning
- kill-entities-on-spawn - instantly kills entities when they spawn
- modify-stacked-entities - modifies existing entities (for WildStacker)
- chance-changing - changes breaking chance when breaking owned, not owned and natural spawners
- ignore-natural - will natural spawners ignore charges

Spawner upgrade GUI layout now supports AIR as background, this will make the background empty.

Added new methods in API for Spawner class.

Fixes:

Fixed additional info lore not showing on stat item in spawner upgrade GUI.