Add item type icons

[mronkko]

This post makes a case for item type icons

http://www.zotpad.com/node/36

The code change to include item type icons instead of file type icons is trivial, so the biggest issue is creating item type icons themselves. Starting from ZotPad 1.1, the file type icons are from the Oxygen project https://github.com/chadnickbok/Oxygen-Icons (same as used in KDE). The item type icons would need to be visually consistent with those, and also scalable (SVG) to support four different icon sizes (iPhone/ iPad and retina/low res).

[mronkko]

Here are the icons that Zotero uses

http://www.famfamfam.com/lab/icons/silk/

[gracile-fr]

• https://github.com/yusukekamiyamane/fugue-icons

[mronkko]

I am a bit uncertain about the fugue icon set. The problem is that these are 16x16 icons that are not scalable, so they would look quite bad as 64x64, which is what zotpad uses.

[gracile-fr]

Sure, I just wanted to link to the icons that Zotero uses (as it's not only famfamfam now).