Preware 2: adds package counts in lists

* adds package counts for top level
* adds package counts for "Available Packages > Types"
* adds package counts for "Available Packages > Types > Categories"
* encapsulated ListItem & renamed "content" to "title" to reduce confusion w/ std. "content" property
    
Open-WebOS-DCO-1.0-Signed-Off-By: Doug Reeder <reeder.29@gmail.com>