feat and refactor: pymycobot

* refactor MyCobot()
* change method name
    get_angles_by_radian() -> get_radians()
    send_angles_by_radian() -> send_radians()
    set_color() -> set_led_color()
* add new method
    get_joint_min_angle()
    get_joint_max_angle()
    set_claw()

Author: zlj-zz

.gitignore

@@ -2,4 +2,6 @@ build/
 dist/
 pymycobot.egg-info/
 
-log
+log
+.vscode/.ropeproject/config.py
+.vscode/.ropeproject/objectdb