[api] fix variable_valuesand variables (passes test)

pyheatpump/variable_values.py

 async def get_variable_value(var_type: str, address: int, time: str=None):
     try:
         args = {
-            'type': var_type,
+            'var_type': var_type,
             'address': address,
             'time': time
         }
 
         row = VariableValue.get(**args)
 
-        return PlainTextResponse(str(row.value))
+        return PlainTextResponse(str(row.get_value()))
     except StopIteration:
         raise HTTPException(404)
 

pyheatpump/variables.py

     return JSONResponse({
         key: {
             add: wo_type(var.__dict__)
-                for add, var in var_type.items()
+            for add, var in var_type.items()
         } for key, var_type in Variable.getall().items()
     })
 
         return await get_variables(request)
     elif request['method'] == 'POST':
         return await set_variables(request)
-    raise NotImplementedError;
+    raise NotImplementedError
 
 
 ROUTES=[