fix example run issue and clean up for arm navigation codes. (AtsushiSakai#528)

* clean up arm navigation codes.

* add project toml

* add pylintrc

* add pylintrc

* add pylintrc

Author: AtsushiSakai

ArmNavigation/n_joint_arm_3d/NLinkArm3d.py

@@ -63,7 +63,8 @@ def forward_kinematics(self, plot=False):
 
         if plot:
             self.fig = plt.figure()
-            self.ax = Axes3D(self.fig)
+            self.ax = Axes3D(self.fig, auto_add_to_figure=False)
+            self.fig.add_axes(self.ax)
 
             x_list = []
             y_list = []

ArmNavigation/n_joint_arm_to_point_control/n_joint_arm_to_point_control.py

@@ -4,7 +4,11 @@
 Author: Daniel Ingram (daniel-s-ingram)
         Atsushi Sakai (@Atsushi_twi)
 """
+
 import numpy as np
+import sys
+from pathlib import Path
+sys.path.append(str(Path(__file__).parent.parent.parent))
 
 from ArmNavigation.n_joint_arm_to_point_control.NLinkArm import NLinkArm