Merge branch 'develop' of github.com:MultiMC/MultiMC5 into develop
Merge branch 'develop' of github.com:MultiMC/MultiMC5 into develop
Added vim *.swp files to .gitignore
Added data structures for Mojang Account.
Added YouCompleteMe config to .gitignore
Add abstract base class for Yggdrasil tasks.
Add test authentication task.

It doesn't actually do anything with the server's reply yet.
Implement auth task's response processing.

The authenticate task can now successfully log a user in.
Implement account list and account list dialog
Implement loading accounts from list.
Implement saving account list to file

Currently it only saves when accounts are added or removed. We'll have
to fix this, but we need signals for when account objects change first.
Add a button to open the account list.

Also fix the account list dialog's close button.
Nuke and pave the old login system

Also, account list now saves profile lists.
Fix crashing when there are no accounts added

The warning message actually displays now when there are no Mojang
accounts to log in with, rather than simply crashing MultiMC.
Tweak the "no accounts" warning a bit.

It now asks users if they want to open the manage accounts dialog to
add their accounts.
Implement removing accounts.
Properly implement launching and downloading

Also added a system to select an active account to log in with.
Merge branch 'feature_yggdrasil' into develop

Conflicts:
	gui/MainWindow.cpp
	logic/OneSixInstance.h

Fix missing session id functionality for legacy and old onesix.