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/pololu1376.py

@@ -1,3 +1,4 @@
+import logging
 import time
 import serial
 import enum
@@ -68,6 +69,7 @@ class StatusError(enum.IntFlag):
 
 class Pololu1376:
 	def __init__(self, serial_port):
+		self.log = logging.getLogger(type(self).__name__)
 		# Deferred-open pyserial idiom: serial_port is constructed with no
 		# port set (see components/actor/stirrerpololu1376.py), so it isn't
 		# actually opened until connect() is called - a missing/unplugged
@@ -88,7 +90,7 @@ class Pololu1376:
 				self.ser.close()
 				self.ser.open()
 			except serial.SerialException as e:
-				print(f"Pololu1376: connect failed: {e}")
+				self.log.error(f"connect failed: {e}")
 				return False
 		# set_output_flow_control() requires the port to already be open -
 		# can only happen here, after open() above, not at construction time.
@@ -96,10 +98,10 @@ class Pololu1376:
 		try:
 			self.stop()
 			self.firmware_version = self.get_firmware_version()
-			print("Pololu1376 F/W-Version:", self.firmware_version)
+			self.log.info("F/W-Version: {}".format(self.firmware_version))
 			return True
 		except Exception as e:
-			print(f"Pololu1376: connect failed: {e}")
+			self.log.error(f"connect failed: {e}")
 			self.ser.close()
 			self.firmware_version = None
 			return False
@@ -142,7 +144,7 @@ class Pololu1376:
 		rsp = self.cmd("GO")
 		errors = self.get_status_errors()
 		if errors:
-			print(f"Pololu1376: ERROR - still in fail-safe after GO, active errors: {errors!r}")
+			self.log.error(f"still in fail-safe after GO, active errors: {errors!r}")
 		return rsp
 
 	def stop(self):