Clean up imports and fix flip_dir logic

Move the re import to the module top in XRPLib/encoder.py and remove the redundant local import. In XRPLib/motor.py, replace the expression flip_dir ^ True with the clearer and correct not flip_dir for NanoXRP, ensuring proper boolean inversion and improving readability.

Author: SaintSampo

XRPLib/encoder.py

@@ -4,6 +4,7 @@
 import rp2
 import time
 from sys import implementation
+import re
 
 class Encoder:
     if "NanoXRP" in implementation._machine:
@@ -53,7 +54,6 @@ def _get_pin_id(self, pin):
         # String representation is usually "Pin(GPIO16, mode=IN)" or "Pin(16)"
         # We look for the numeric part associated with the GPIO.
         s = str(pin)
-        import re
         match = re.search(r'(\d+)', s)
         if match:
             return int(match.group(1))

XRPLib/motor.py

@@ -58,7 +58,7 @@ class DualPWMMotor:
     def __init__(self, in1_pwm_forward: int|str, in2_pwm_backward: int|str, flip_dir:bool=False):
 
         if "NanoXRP" in implementation._machine:
-            self.flip_dir = flip_dir ^ True
+            self.flip_dir = not flip_dir
         else:
             self.flip_dir = flip_dir