FrameManager manages all frames. It keeps a list of every controller. Its
also the place to create a new frame, or save and close all frames at once.
Frame controllers are plugins.
See Also: FrameExtensionHandler author: fdietz
Called when a frame is closed. The reference is removed from the list of
active (shown) frames. If it's the last open view, the view settings are
stored in the view list.
Parameters: c - Reference to frame controller for the view which is closed
Saves default view settings for given view type. These will be used as
startup values next a view of this type is opened. Though, views opened
at startup will use settings from viewlist instead.
Only one set of settings are stored for each view id.
Parameters: view - view settings to be stored