[enhancement?] archive file support

[yoshi314]

It would make so much sense to have the game load its assets from an archive. There is no point in having 10K+ data files.

Something like libarchive might do transparently load data off singular data.zip.

[rsn8887]

I am not planning to do this because I think it is a lot of work for a small benefit of having less files. But if anyone is interested and makes a PR, I agree this would be a nice enhancement.

Before starting on this, please keep in mind the game loads files in multiple locations, not just in the C++ source, but also from some lua scripts, and from within functions of the xerces library, so this might require a major refactoring of the codebase as well as maybe some changes to the xerces lib port.

[rsn8887]

I just realized, there's code to support zipped level files, which will make installation much faster.

I just never got around to testing it, mostly because the original Windows/OSX version is supplied with unzipped files, too. So I suspected there's a reason for that and probably some bug or problem with the builtin zip support.

Here's the comment in the code about zip file support, if you want to test it:
// file may be zipped - for "levels/Sokoban/mic_60.xml" we will look for
// "mic_60.xml" and "Sokoban/mic_60.xml" at "levels/Sokoban.zip"

[yoshi314]

ok, i'm going to try this out, thanks.