Add API versions and improve playlist API docs #857
Merged
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Added
@since
tags for all API files, functions and types stating since which projectM release each one is available. This will make it easier for developers to decide on which function they want to use to support older versions, or resolve functions available in newer versions at runtime to make use of a wider range or projectM shared library versions and features based on availability.Also added clarifications in the API docs for the issue discussed in #854 regarding how callbacks are registered and reset by the playlist library.
Note this one includes the changes already PR'd in #856 - ignore those, I'll lazily merge this one after the copyright date changeset to save me a rebase.