Examples should use import pysketcher as ps instead of import * from pysketcher

[rvodden]

• What is the current behaviour?
  Many of the examples use the old, deprecated, import mechanism import * from pysketcher

• Please provide the steps to reproduce and if possible a minimal demo of the problem
  Have a look through the examples

• What is the expected behaviour?
  Examples should use import pysketcher as ps

• What is the motivation / use case for changing the behaviour? That is, what does this bug prevent PySketcher users from doing?
  It means that the examples will represent the behaviour we'd like our users to adopt.

• Please tell us about your environment:

  • Version: 0.0.10
  • OS: [all | Linux | MacOS | Windows ]
  • Python Version: [all | 3.8 | 3.9 | 3.10]

• Other information (e.g. detailed explanation, stacktraces, related issues, suggestions how to fix, links for us to have context, eg. stackoverflow, gitter, etc)