Lint webide examples

Hi there,

This MR is the result of the use of lint_ligo linter on the examples of the webide.

Mainly:

• It changes deprecated variables to their new counterpart.
  • As get_force do not have any counterpart, I made two specialized functions mimicking the original behavior.
• Remove some unused variables.

But there is still some questions:

• https://gitlab.com/nobrakal/ligo/-/blob/lint_webide_examples/src/test/examples/pascaligo/fa-1.2.ligo#L112 The variable src is marked as unused. How can we fix it?
• Is there a way to avoid let void : unit in cameligo? See https://gitlab.com/nobrakal/ligo/-/blob/lint_webide_examples/src/test/examples/cameligo/id.mligo#L139