Lazy httpclients, text/jobject parsing converted to models (mostly), big refactor to simplify codebase (*cough* 2.6). Part 1

[asutermo]

• Add C# Models for most JSON (just Xbox right now)
• Start refactor to minimize dupe code
• create rest api classes for xbox, ta, github
• Refactor viewmodels in-progress to use XboxRestApi, GithubRestApi or TrueAchievementsRest Api
• Lazily instantiate XboxRestApi so we can be ready as soon as XAUTH is available

For part 2:

• Move rest of http/parsing/requests logic to their respective APIs. TODO: event based, and a few others.
• Remove the rest of the uses of dynamic
• Strip out unecessary tostrings, etc.

Tested:

• :heavy_check_mark: Profile Details
• :heavy_check_mark: Manual Spoof
• :heavy_check_mark: Auto Spoof
• :heavy_check_mark: Get Achievement Lists for Xbox Title and 360
• :heavy_check_mark: UnlockAll (Tested w/ large list, halo infinite)
• :heavy_check_mark: EventBased (Gears 4 tested)
• :heavy_check_mark: Title ID Search (empty, halo, halo 3)
• :heavy_check_mark: Game Search (empty, games I don't have, dead space)
• :heavy_check_mark: Drag Window (ensure theme issue doesn't occur)
• :heavy_check_mark: Achievement Search (empty, achievements I have, achievements I don't have)
• :heavy_check_mark: Update / Github Flow
• :heavy_check_mark: Privacy
• :heavy_check_mark: Copy to Clipboard