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:

• [x] Add Interface Usage Implementation
• [x] Add Attribute Usage Implementation
• [x] 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.
• [x] Implement save handlers to allow for flexible save types.
• [x] Implement save handlers in the plugin classes.
• [ ] Implement save auto-loading at plugin load.