- added basis for possible "overlay" to block ui operations while loading/saving
 * could also use plugins like jquery block , but maybe we can do something simpler
 * deactivated for now
- fixed various code editor tab related issues:
 * pressing the tab key will not "iterate" through the list of open tabs, but do its job for indenting the code in the currently open file
 * pressing the tab key will inside the code editor , with multiple lines selected will not delete them anymore, but indent them all, as it should
- added examples folder, nothing really there yet