changes to facilitate IDEA project
ignore IDEA files
added ability to display icons for item contents - configured in contents_icons.json
added gson lib
moved stream2str from wiki to util
added option to show/hide contents icons
updated changelog
Merge branch 'master' into craftwindow
added sugar to list of content icons
Merge branch 'master' into craftwindow
test transition of craft window from MenuGrid/Wiki data to JSON-based ItemData