ICBM - Interconnected Block Missiles

Early preview version for 6.0.0 release. Work is still needed for this to be stable. However, should work enough to toy around with the new features.

• Added: cluster missile - dynamic item support allowing anything to be added to payload. Some items have special projectile handling allowing spawning entity version instead of item.
• Added: projectile handling for arrows
• Added: projectile handling for potion arrows
• Added: projectile handling for spectral arrows
• Added: projectile handling for eggs
• Added: projectile handling for snowballs
• Added: projectile handling for spawn eggs
• Added: Parachute - allows attaching items/blocks for deployment
• Added: Balloon - similar to parachute but inverted gravity... mostly for lolz
• Added: ballistic arc version of rocket launcher. Allows firing a missile in same way as silo or basically a javelin launcher
• Reworked: FlyingBlocks to better handle placement and collect item version. Allows remembering machines and more complex blocks. Impacts redmatter, anti-gravity, endo, exo, sonic, and works with parachute system
• Rework: Anti-gravity to remove 1 block per tick, apply outward motion, and extend flying block life to encourage return to ground
• Reworked large chunks of content to use action system, which will replace projectile and blast system as a generic conditional do-task system. For developers, this means large chunks of the API are deprecated and changed. Future plan is to feed everything through the action system and expose logic via listeners. Everything will have an action source, cause-by chain, and be abstracted to improve flexibility. Allowing for replacement of logic by other mods and interception of actions for better integrations. Such as providing improved world protection, handling admin logging, or even just showing events on a map.