Expanding and contracting is now always smooth (to progress bar)
Set default values of both search boxes to 'C:\' to make it easier to search for a directory
Get rid of the 'All extensions' checkbox; leaving the extensions field empty now functions like that
Code cleanup by ReSharper
Get rid of Prompt class and some minor cleanup by myself
The two labels of the progress bar no longer overwrite each other when more than 1000 files were found
Disable all controls (except for Show Progress Bar checkbox and Stop button) while merging
Disable/enable Stop and Merge buttons BEFORE we start searching for files in the given directory and enable them again if no files were found. Fixes issue where it would look like the application did nothing when searching through huge directories like a root disk (while having sub dirs checkbox checked)