Add more features for ContentList and ContentDetail plugins

[TheHadiAhmadi]

currently these plugins are not usable as much as they should:

1. There is no pagination for Content list.
2. Content List doesn't support Sorting.
3. Content List doesn't support Filtering.
4. Content Detail plugin only works with Id (id of the PluginContent item should should be in url) At least we should support Slug field too.