log: route task/component status output through logging, not print()

AttributeChange (the common base of every ATask and component ABC) now
sets self.log = logging.getLogger(type(self).__name__), so components
no longer need to hand-type their own name into each message. Wired
logging.basicConfig() in server/brewpi.py with a bare "%(name)s:
%(message)s" formatter - Tee (see prior commit) still supplies the
"<date>T<time>:" prefix, so lines read "<date>T<time>:<component>:
<message>" without double-stamping, and third-party loggers
(websockets, asyncio) now get the same formatting for free.

Converted the print() call sites that were standing in for this in
tasks/ and components/ (leaving __main__ demo blocks and explicit
debug-dump helpers alone).

tasks/heater.py

@@ -178,11 +178,11 @@ class HeaterTask(ATask):
 						try:
 							self.device.process()
 						except Exception as e:
-							print(f"HeaterTask: comm error, marking disconnected: {e}")
+							self.log.error(f"comm error, marking disconnected: {e}")
 							self.disconnect()
 						await asyncio.sleep(self.interval)
 			except Exception as e:
-				print(f"HeaterTask: unexpected error, recovering: {e}")
+				self.log.error(f"unexpected error, recovering: {e}")
 				try:
 					self.disconnect()
 				except Exception:

tasks/server_log.py

@@ -143,4 +143,4 @@ class ServerLogTask(ATask):
 		for name in (filename, self._latest_filename()):
 			with open(os.path.join(self.path, name), 'w') as f:
 				json.dump(log_data, f, indent='\t')
-		print('Server log: wrote {} samples to {}'.format(len(self._samples), filename))
+		self.log.info('Wrote {} samples to {}'.format(len(self._samples), filename))

tasks/stirrer.py

@@ -88,11 +88,11 @@ class StirrerTask(ATask):
 						try:
 							self.device.process()
 						except Exception as e:
-							print(f"StirrerTask: comm error, marking disconnected: {e}")
+							self.log.error(f"comm error, marking disconnected: {e}")
 							self.disconnect()
 						await asyncio.sleep(self.interval)
 			except Exception as e:
-				print(f"StirrerTask: unexpected error, recovering: {e}")
+				self.log.error(f"unexpected error, recovering: {e}")
 				try:
 					self.disconnect()
 				except Exception:

tasks/sud.py

@@ -634,7 +634,7 @@ class SudTask(ATask):
 		await self.msg_handler.send(data)
 
 	async def on_process(self):
-		print("{}: Started with interval {} s".format(self.msg_handler.get_key(), self.interval))
+		self.log.info("Started with interval {} s".format(self.interval))
 
 		self.sud.set_on_changed('step', self.on_step_changed)
 		self.sud.set_on_changed('state', self.on_state_changed)

tasks/tempsensor.py

@@ -24,7 +24,7 @@ class TempSensorTask(ATask):
 		try:
 			self.sensor.temperature()
 		except Exception as e:
-			print(f"TempSensorTask: comm error priming sensor: {e}")
+			self.log.error(f"comm error priming sensor: {e}")
 		self.sensor.set_on_changed("temp", ChangedFloat(self.on_temp_changed, prec=1).set)
 
 	def on_temp_changed(self, value):
@@ -44,5 +44,5 @@ class TempSensorTask(ATask):
 			try:
 				self.sensor.temperature()
 			except Exception as e:
-				print(f"TempSensorTask: comm error reading sensor: {e}")
+				self.log.error(f"comm error reading sensor: {e}")
 			await asyncio.sleep(self.interval)