Add OpenFunscripter as media source

[Yoooi0]

Api: OpenFunscripter/OFS/issues/59

[OpenFunscripter]

If you have suggestions on what this should look like feel free to make them.
I want to get this right the first time and not have breaking changes later down the line. 🙂

Currently I have these events.
project_change indicates that you have to clear everything after which you would receive a chain of events to reinitialize to the new project.

And this funscript_change event (which looking at the code should also be defined in the other file).
The axis mapping can only be determined by looking at the name field and checking for the conventional .roll, .sway,... extensions.
Note this event still needs an additional identifier because the name can change.
I'll just add some id value to uniquely identify the script. 🤨

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[Yoooi0]

Yup, will make any suggestions in your issue to not mix things up 👍

I had it working very quickly, I just have to make some internal changes in MFP because the axis mapping is done very late now. Probably have to make it a global utility method.