Start implementing bookmarks/unread threads

The buttons for the views should work, but the underlying logic needs to
be worked on. Unreading threads could be placed in the ThreadManger, but
bookmarks should probably be placed in their own manager.
Refactor Thread/Forum Manager, Add Page Scrolling Collection

Starting to refactor the model structure for how Forums, subforums, and
threads are handled. The current structure is unsustanable and needs to
be made less complex.
Visual Changes

Added new app icons, refreshed some buttons, added a (nonfunctional)
bookmark button to the thread view.
Merge pull request #10 from KitF/master

Visual Changes
Various fixes

Fixed bookmark button, it should actually bookmark threads now.

Fixed background status function. Live tiles should load now.
Small UI Changes

Changed the height of the post box to be static for now.
Update Tile Color
Small UI Changes
More UI Changes
Update Thread List Page Stack Panels
Add logic for Toast Notifications
Revert "Add logic for Toast Notifications"

This reverts commit 62619699c72f225d3302fa44d10016005b7522e0.
Revert "Revert "Add logic for Toast Notifications""

This reverts commit 1e4fe2ddc5e96a7a4c7e90b72205eaf3903cbde3.
Fixed broken unit tests around date/time parsing.
Cleaned up existing unit tests, added some new ones!
Merge pull request #11 from DanielBMann9000/master

Giving some unit test love
Update toast notifications