Replace deprecated serial_handler imports with pslab.connection

Author: Architrb1795

docs/internal.rst

@@ -7,7 +7,7 @@ here.
 Serial handler
 ---------------
 
-.. automodule:: pslab.serial_handler
+.. automodule:: pslab.connection
     :members:
     :undoc-members:
     :show-inheritance:

pslab/cli.py

@@ -32,7 +32,7 @@
 from pslab.instrument.logic_analyzer import LogicAnalyzer
 from pslab.instrument.oscilloscope import Oscilloscope
 from pslab.instrument.waveform_generator import WaveformGenerator, PWMGenerator
-from pslab.serial_handler import SerialHandler
+from pslab.connection import SerialHandler
 
 
 def logic_analyzer(

pslab/external/gas_sensor.py

@@ -3,7 +3,7 @@
 from typing import Callable, Union
 
 from pslab import Multimeter
-from pslab.serial_handler import SerialHandler
+from pslab.connection import SerialHandler
 
 
 class MQ135:

pslab/external/hcsr04.py

@@ -4,7 +4,7 @@
 
 from pslab.instrument.logic_analyzer import LogicAnalyzer
 from pslab.instrument.waveform_generator import PWMGenerator
-from pslab.serial_handler import SerialHandler
+from pslab.connection import SerialHandler
 
 
 class HCSR04:

pslab/external/tcd1304.py

@@ -35,7 +35,7 @@
 from pslab import PWMGenerator
 from pslab.instrument.waveform_generator import _get_wavelength
 from pslab.protocol import MAX_SAMPLES
-from pslab.serial_handler import SerialHandler
+from pslab.connection import SerialHandler
 
 
 class TCD1304: