Allow simplification of path definition as a simple list of functions

[charlieparkes]

A simple path with one action

PATHS = {
    "EXAMPLE": [
        Action(functions=[test_func, test_func2])
    ]
}

may now also be defined as

PATHS = {
    "EXAMPLE": [test_func, test_func2]
}

[codecov]

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@@            Coverage Diff            @@
##             master       #3   +/-   ##
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  Coverage          ?   44.91%           
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  Files             ?       14           
  Lines             ?      777           
  Branches          ?        0           
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  Hits              ?      349           
  Misses            ?      428           
  Partials          ?        0           

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