Add the simple api client from GHfVS, add credential management stubs per platform, add octokit and TPL 3.5 ports.
Remove CredentialManagement for now, it blows up on Mono (likely due to marshaling), so needs testing first.

Git status output processor and tests

Initialize methods run logic that can depend on other things being
instantiated first. The order should be:

- Constructors
- Initialize methods for non-UI classes
- Run methods for non-UI classes
- Initialize methods for UI classes
- Run methods for UI classes

BranchListOutputProcessor cleanup and unit test

Platform based git environment wrapper

Extending GitEnvironment with WindowsGitEnvironment and LinuxBasedGitEnvironment (and mac!)
Used WindowsGitEnvironment to provide a custom find routine for Git for Windows
ProcessManager created it's own instance of GitEnvironment
Made ProcessManager more testable by providing it's dependencies via a constructor

Adding SSH as an abbreviation

Adding NCrunch support

Compile GitHub.Unity into the unity test project

Fix issues with main Unity thread hanging due to tasks processes

Need this so the folder doesn't go away

Make sure we load icons from disk when letting Unity build things

Stop deleting the installer, it's annoying

Ignore things in the TestProject and add missing asset (5.5)

Instead of compiling in-place, put the build artifacts into root/unity/TestProject. This way, Unity can load the UnityExtension project and build it without getting confused about existing build artifacts, and it can also load the TestProject with the compiled dlls and we can refresh them from VS without having to change paths.

If a process can't find the executable to run or otherwise throws an exception on Start, then it will never run and will never "exit". The uncaught exception would just get caught by Unity and hidden away, and the tasks loop would just endlessly wait for the process to finish, and hang the whole thing.

We don't have to actively schedule a call to WaitForTask on the main thread when we're running background threads. The loop won't grab another task until the activeTask is done, so it will just sleep and check periodically. Actively spamming the main thread with repeated wait calls causes slowdowns for Unity - WaitForTask schedules itself to run, and the Tasks main loop also does, so every frame two calls were being made to it - excessive!