Different filters depending on site

[FelixSFD]

If we add support for more pages in the SE-network, we should make lists that define, which filters are used on which site. This could be achieved by adding the interface FilterList and classes like StackOverflowFilterList and AskUbuntuFilterList that are implementing this interface

[Bhargav-Rao]

Yes, this is quite simple to implement. Just like the command lists, we need to pass another object, for that. I'll try to find some time and implement it.

[Bhargav-Rao]

I found a simpler way of doing this by passing the sitename as a parameter while doing the filters check, I refactored it in commit 65638f9.

Unlike the command lists, which was per room, the filters list is per site, hence my previous comment about passing an additional object, is not that suitable.

I am still to decide whether to have an interface FiltersList, or just leave it in the way I've done it now.