Custom Function Signatures

[skarim]

Adds support for more flexible custom function definitions with user-defined parameters.

The --customFunction option now supports function signatures in the following format:

yourCustomTrackFunctionName(EVENT_NAME, PROPERTIES, customFieldOne, customFieldTwo)

• EVENT_NAME is the name of the event you are tracking. It should be a string or a pointer to a string. This is required.
• PROPERTIES is an object of properties for that event. It should be an object / dictionary. This is optional.
• Any additional parameters are other fields you are tracking. They can be of any type. The names you provide for these parameters will be used as the property names in the output.

For example, if your function has a userId parameter at the beginning, followed by the event name and properties, you would pass in the following:

yourCustomTrackFunctionName(userId, EVENT_NAME, PROPERTIES)

If your function follows the standard format yourCustomTrackFunctionName(EVENT_NAME, PROPERTIES), you can simply pass in yourCustomTrackFunctionName to --customFunction as a shorthand.

Resolves #11