Adds various Tab controls with children components.
Adds various Tab controls with children components.

* File browser window
* project treeview window
* Messages window
* Scribble window
* Terminal window

Improved 'File Open' processing and updating the project treeview and
editor tabsheets.

wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI