Add FilterPage
FilterPage: Add ui resource
Add FilterListEntry
Corebird.vala: Add Alt+7 accelerator
dm-thread-entry: Remove delete button

It never worked anyways and there's no API on Twitter's site to ever
implement it.
Add accounts/Create.2.sql

... since we need some place to save the filters.
FilterPage: Create a FilterListEntry per filter
Add AddFilterDialog
Make the AddFilterDialog a GtkWindow
Tweet: Use an array to store the urls

And at the same time, introduce a 'sorted' parameter to TweetUtil's
get_formatted_text and get_real_text so the urls don't get resorted at
every call
ProfilePage: Don't turn on notifications for new followee
AddFilterDialog: Add more layout widgets
AddFilterDialog: Add content entry label
Tweet: Add get_urls function
MainWindow: Correctly initialize the size of the pages array
filters: More ui code
sql/accounts/Create.2.sql: Add default value for block_count
filter-list-entry.ui: Add tooltip text to the remove button

Also, don't use a "close" icon for a delete action.
Add Filter.vala
Account.vala: Add filter list

The account-local list will be used to determine what tweets to hide.