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).

components/actor/heater_hendi.py

@@ -45,7 +45,7 @@ class HeaterHendi(AHeater):
 			# tick loop (with self.device.open(): activate(True)/(False)) and
 			# from a client's Connect/Disconnect command, neither of which
 			# expect activate() itself to ever raise.
-			print(f"HeaterHendi: comm error in activate({enable}): {e}")
+			self.log.error(f"comm error in activate({enable}): {e}")
 			self.disconnect()
 
 	def is_activated(self):
@@ -55,7 +55,7 @@ class HeaterHendi(AHeater):
 			s = self.hendi.isRemoteEnable()
 			return '1' in s
 		except Exception as e:
-			print(f"HeaterHendi: comm error in is_activated: {e}")
+			self.log.error(f"comm error in is_activated: {e}")
 			self.disconnect()
 			return False
 
@@ -72,7 +72,7 @@ class HeaterHendi(AHeater):
 			self.hendi.setPowerWatts(power)
 			self.power_eff = self.hendi.getPowerWatts() if power > 0 else 0
 		except Exception as e:
-			print(f"HeaterHendi: comm error in process: {e}")
+			self.log.error(f"comm error in process: {e}")
 			self.disconnect()
 			self.power_eff = 0