…ete work when cmd + backspace key is pressed

…for deletion and renaming logic

…er to FileManager class from Tree class.

…ion for unit tests

…er features

…ead of bool for better error handling

…tion result handling

…zing success checks in isSuccessful method

…nd removing unnecessary OS checks

…setup instead of root CMAkeList

…inking

…aryDir for file and directory operations