[infomanager] add ListItem.IsCollection

[mkortstiege]

Adds boolean info label ListItem.IsCollection.

[un1versal]

@mkortstiege thanks for adding this. @ronie @da-anda this comment only here to show what possible.

Lacking experience in skinning limits me, based on this PR above, I hacked around to tried to implement this into confluence.

See un1versal@0a02a47

Literally just copied the 3D flag implementation. I think.

Before

After

There are a few problems with this:

1. When you focus on the collection in list view, the flag disappears _Battlestar Galactica Collection_ example

2. The flag is only visible in _Media Info View 2_ I probably missed something somewhere if not the 3D flag will have same issues.

3. Position is copied from 3D flag implementation so it will overlap with 3D in some conditions.

For these 3 reason I dint PR this half hack as clearly my attempt is flawed but shows what is possible with the correct skinning skills. Would be nice to get it in and take listview a little closer when moviesets are listed.

[da-anda]

I don't think we need the collection icon along with the stream details because a collection usually doesn't have any stream details and would be a lonely icon just like in your BattleStar screenshot. Adding the icon to the list is nice though.

[un1versal]

@da-anda, Yes! See Discussion on my attempt above. as its not ontopic and it is github after all. 👍

[phil65]

added by removing code ;)
#6900

[mkortstiege]

Included in #6900. Closing.