* hook_gr_token_info().
 * hook_gr_tokens()

Change format of hook_gr_info()
 * Rename 'needs-data' to 'item-needs-data'
 * Add 'item-type'

Simplefy hook_gr_queue().
 * Move renderion of items to the module.

Also replace hook_gr_item_token_type to hook_gr_info.