- lots of cleanup , fixes and updates to the code editor:
 * fixed bug where reloaded files would not compile (bad current project set in project manager)
 * fixed bug in csg processor accidentally intruced in last commit (try catch block was not complete)
 * updated the code editor tree view to enable (finally) adding, deleting and renaming files
 * toolbar is gone, was not needed
 * code editor tree view also has some basic validation of the different operations above (can't delete main file, can't have duplicate named files etc)
 * some minor changes to the dialog regions
 * some css updates to fix dialog regions header screw up, some esthetic changes etc
- removed all the old , unused files in the persistence folder