Loads a saved variable under the specific key
If no key is given, it will return a table with all saved variables
  overload 1:
                        
config:load()  
  | Method Property | Fluent Description | Representation | 
|---|
 | Return Value | a table |  | 
 
  overload 2:
                        
config:load(key)  
  | Method Property | Fluent Description | Representation | 
|---|
 | key accepts | a String |  | 
| Return Value | anything |  |