Added read-only file cache #246
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Here I added a cache for read-only (.dat, images, sounds) files to only be loaded into memory once and re-read from there. This reduces the number of I/O accesses to only once per file.
This optimization is not really necessary for normal SDLPop usage as the frequency of I/O access is pretty low. However, it's crucial for the Jaffar bot (and perhaps any other SDLPop based projects) that the I/O accesses are reduced to the minimum possible. In particular, when the bot advances to the new level, it requires re-loading the sprites once per state. Since millions of states advance to the next level at the same time, this breaks the I/O system and crashes the bot. This fix helps in alleviating the pressure.