Improve timeline filtering behavior.

Remove status which does not satisfy filter predicate.
Improve input experience.

Improve auto-stashing behavior.
Fix a bug of attaching image selection.
Fix initializing favorited/retweeted status.
Improve behavior around threading.
Implement LazyImage resolver
Handling event improved.

updating status data is more efficient.
Improve around timeline UI.
Fix library reference.
Update tab management systems.
Refactor sources.
Fail starting in standalone mode.
Fix memory leak.

Infinite observable cause memory leaks.
Fix AVLTree bug.
Account selection is now save to tab.

Reconstruct tab managing model.
add color mark to favorited/retweeted status.
Fix state update leak.
General performance improved.

Now using TextBlock instead of RichTextbox.
Fix some memory leaks.
Locking scroll is temporarily disabled due to UI freezing problem.
fix unfav/unrt bug.

User information is not removed in unfavoriting/unretweeting.
Fix problems around escaping.

Now TwitterStatus.Text holds unescaped string.
Fix problems in applying entities to status.