I did not look for a bit of the time unit tests and updates on of the packages, so... Now I've done it including series of fixes for AST.

FROM NOW ON GO 1.22 IS REQUIRED

This PR additionally resolves:

• Introducing new Visitor and Storage calculation into the AST
• Fixing numerous bugs while parsing the contracts...
• Disabled unit test for observers as that package requires node to be running. As well in the future this package will be removed.
• Introduces String() into the AST node paths in order to capture actual text of the specific node.
• Payable conversion reference nil set
• Client pool unit tests
• Bumping up the solc-switch to 1.0.4 as 1.0.3 is just bad...