Documentation first stub
Convention requires this file.

And perhaps more importantly, to run the test from IDE I need this file
Made CpsScript context-aware

CpsScript needs the 'execution' reference to be able to invoke step functions.
Making this automatic helps cps-global-lib because users won't have to pass
around a reference to it.

See the test case improvement for the simplification this provides.
Explaining how to write shared scripts, because it's not quite obvious