Key view loop fixes/improvements

- Removed unnecessary code at beginning of CPTextField -becomeFirstResponder that might have been a hack to get around a bug I fixed.
- Fixed race condition in setTimeout closure in CPTextField -becomeFirstResponder.
- CPWindow -setInitialFirstResponder now works reliably and follows Cocoa behavior in that if -makeFirstResponder is called with something other than the window before the window is first shown, it will override the initial first responder.
- Like Cocoa, until the first responder is set during window load, the first responder is the window by default, not the content view.
- Optimized search for any view that has a previous/next key view set.
- Sheets can become key windows again.
- CPWindow -recalculateKeyViewLoop now just marks the loop as dirty, per Cocoa docs.
- CPWindow -autorecalculatesKeyViewLoop now behaves per Cocoa, it only has an effect when views are added or removed.
- If the first responder does not have a valid previous/next key view, it does not resign to nil, per Cocoa behavior.
- Code optimization and cleanup.
- Test app (KeyViewLoopTest) that demonstrates various scenarios.
More key view loop madness

- It turns out Cocoa DOES recalculate the loop when calling recalculateKeyViewLoop. It does not wait until selectNext/PreviousKeyView is called.
- Cocoa calculates the key view loop for nibs that do not have one, but does not call recalculateKeyViewLoop.
- If there is no first responder and no initial first responder when a window first becomes key, use the first valid key view, not the first geometric key view.
- Made allViews function a method, not sure why it was a function.
- Unit tests now pass.
Key view loop enhancements...

- Nested views are now handled recursively as they are in Cocoa.
- Added a nested view test in the test app.
Key view...

- Factored out blur handler from CPTokenField into CPTextField.
- CPTextField will no longer lose focus unnecessarily.
- Changed switch style in CPWindow -sendEvent.
- Added menu bar to KeyViewLoop test app.
Hooked up the edit menu
Merge branch 'key-view-loop'

Conflicts:
	AppKit/CPWindow/CPWindow.j