Added comments to drawset.c. Changed initialization to take the number of worker threads as a parameter and split the function to get the initial buffers into one function for the producer thread and one function for the consumer threads.
Changed the engine to run the renderer on the main thread and the game logic on the secondary thread.
Started work on transitioning engine over to using SDF files as data source.
Finished moving engine to using SDF data files for data. Also added example SDF file.