To simplify text alignment, the InfoLabel now uses an FTSimpleLayout object
to automatically wrap text within the bounds of the OpenGLCanvas. This will
allow a welcome message and simple instructions to be displayed.

Since every processor now gets asked to enable() prior to the start of
acquisition, it's much simpler to move the steps involved in preparing
for acquisition into these methods. This the processor from beginning
acquisition when prepareToPlay() is called upon initialization.

When an LfpDisplayCanvas was hidden for more than a few seconds, it would lose
track of the displayBufferIndex, causing it to pause for a few seconds when
it comes back into view. Now, the DataViewport sends a "refresh" reminder
to the canvas, to remind it to update its buffer indices in order to
display new data.

GenericEditors now check their "selected" status before asking to be deleted.

The FilterViewport pauses for 50 ms after deleting a processor in order to
avoid double-deletions.

This reverts commit 307a5c3d.

Made UIComponent a MenuBarModel