Run ShakeTune as an in-process Klipper module (#100)

* feat: Run ShakeTune as an in-process Klipper module
* feat: install shaketune dependencies to klipper venv
* refactor: replace print_with_c_locale with klipper console output with stdout fallback

K-ShakeTune/K-SnT_axes_map.cfg

@@ -52,7 +52,7 @@ gcode:
     ACCELEROMETER_MEASURE CHIP={accel_chip} NAME=axemap
 
     RESPOND MSG="Analysis of the movements..."
-    RUN_SHELL_COMMAND CMD=shaketune PARAMS="--type axesmap --accel {accel|int} --chip_name {accel_chip}"
+    SHAKETUNE_POSTPROCESS PARAMS="--type axesmap --accel {accel|int} --chip_name {accel_chip}"
 
     # Restore the previous acceleration values
     SET_VELOCITY_LIMIT ACCEL={old_accel} MINIMUM_CRUISE_RATIO={old_cruise_ratio} SQUARE_CORNER_VELOCITY={old_sqv}