Add API to account list to check usable account.
On removed, redirect to login page if there is no more account(TODO: need SDK update for core callback)
- Add Gui/Core/Model for friends.
- Add MagicSearch.
- Fix double free on Account list.
- Fix concurrency in SafeConnection destruction.
- Update SDK : Use of onAccountAdded from SDK.
Add Async/Sync functions to post lambda on model thread.
Fix missing defines on headers.
Move Login c++ logic into core for MVVM.
Write async login.
Auto core iterate (30ms).
Clean exit by stopping core before deletion.