Save GUI states between sessions.

[weisJ]

Add support for ssaving the state of the gui between sessions e.g. if the console is open at how big it is, the sorting of the editor tabs, breakpoints, scroll positions etc...

[weisJ]

SplitPanes and the TabFrame now support session states. I’m not sure which other components may profit from this, but possible candidates are:
-EditorTabbedPane
-ScrollPanes

There are still some flaws with the current approach e.g. only one frame is supported effectively.

[weisJ]

Added support for multiple frames