Toolbar support, Fixes #507

Everything looks correct but knowing me, you're best off pulling this branch locally and having a play with it. I had to make an initialized variable because the Toolbar plugin doesn't instantiate ToolbarManager fast enough.

We will need to slightly change our packaging scripts.

We need to include the full toolbar package in our mod:
https://www.dropbox.com/s/exygwtil6e14czv/Toolbar-1.4.1.zip

We will also have to copy the new KMPButton folder into GameData/KMP/ (This is where I hardcoded it, it kinda made sense).

Give it a simple yay or nay if you like the idea, on the bad side it pulls in another dependency which may slow our updating between KSP versions, on the good side, 1 button hides all KMP windows.