Standardize the file types we use in this repository

[BenjamenMeyer]

Looking through I notice we have a lot of different file types, sometimes for similar jobs - e.g JPG/PNG, 7z/ZIP, etc.
We should standardize which file types we are going to use for different tasks and then convert everything to using just that one file type.

[BenjamenMeyer]

we should probably use 7z for all our compression needs as it's fully open source, patent free, and multi-platform. gz/bz2 are similar but more popular on the Unix/Linux side and not so much on Windows. ZIP could get us in trouble (technically).

[BenjamenMeyer]

We should use PNG as much as possible; JPG is good, but IIRC PNG can do everything a JPG can and avoids issues with patents, etc.

[evertvorster]

Since the patents have expired on GIF, why are we not using that? GIF is much more compact than PNG. Evert Vorster Awesome Chapters Tours http://www.awesomechapters.com Tel: +264 (0) 811477690

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[Loki1950]

GIF can not be used for normal maps not enough bits assigned to each colour.

[BenjamenMeyer]

@evertvorster technically the patents have expired on the JPGs too; but it's one of those formats - and GIF won't be much different - where some wacko may still come out of the woodworks with a patent.

[BenjamenMeyer]

We should also use OGG+Vorbis+Theora for audio/video as much as possible too.