bootstrap SaveModule SP

[rslgp]

encapsulates Save Load complexity, and can be continued with MP compatibility,
the dev only need to instance the SaveModule, and use GlobalVar_save(), or GlobalVar_load(), and worry only about their own data structure save logic, not worry about PZ details and version about it

[rslgp]

and it can be improved to handle MP compatible too, like helicoper events does

so dev dont worry about SP and MP implementation about save load

just call the method from SaveModule,

and pass they own save load functions, dealing with prep data, and received data

[rslgp]

and there is the way using filewriter too, that can add more versatility