Add support for Mod custom save data

[KrayOristine]

What is this feature and what does it have or provide?:
To allow modder to save their mod data without messing with vanilla save and thus preventing vanilla save corruption.

Current state of it:
WIP

[Redforce04]

To Do List:

• Add Interface Usage Implementation
• Add Attribute Usage Implementation
• Add API Endpoints to manually save
• Implement json parsing for save system.
• Add property hooks to ISave properties to trigger auto saves
• Add IDisposable implementation for large updates without multiple writes.
• Implement save handlers to allow for flexible save types.
• Implement save handlers in the plugin classes.
• Implement save auto-loading at plugin load.