adjusted some colors, added a few common extensions for codeblocks

for backwards compatibility

now we no longer limit generation to the extensions in mime types,
because file icons are used in downloadable code blocks, too.

All icons were regenerated with the latest update of the generator.

the new template allows to use a favicon in media/wiki/favicon.ico so we
should support uploading it as well.

This patch reduces the colorspace of GIF files and has optipng
optimization run on PNGs. Changes shouldn't be visible except in
filesizes.

Passed every png file through http://www.smushit.com/ysmush.it/ saving some 1-2kb of binary image data

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This patch add a link to the media manager when no JavaScript is available.
Users can upload and browse for pictures now without the need for JavaScript
only inserting has to be done manually then.

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This patch adds a completely rewritten media popup. The following noteworthy
changes were made:

- media manager uses a collapsible namespace tree
- media manager uses AJAX if available
- media manager popup can be kept open when selecting a media file
- only one template is used for the media manager :!: Template
- Editable image metadata is configured in conf/mediameta.php now
- The JS cookie mechanism was enhanced to store key/value pairs
- Language strings can be exported to JS in js.php

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Now all filetype icons have the same style and work on light and dark
backgrounds. A test file was added to lib/images/fileicons/index.php

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