DateiRenamer - port features from CLI application to GUI application

[uwuhazelnut]

Task: port all the remaining features of the CLI file renaming tool to the WinForms renaming tool

[uwuhazelnut]

Changing suffix - done

Creating name patterns - done

Moving digit blocks - done

[uwuhazelnut]

Missing features as of now are: adding digits, removing digits, adding leading zeros (all these features are meant to be accessible in the digitsForm)

[uwuhazelnut]

Adding digits, adding leading zeros - done

Deleting digits is partly done. A new form to display all the skipped file names must be added still.

[uwuhazelnut]

Deleting digits is done now. A new form dialog is shown to display the conflicting file names:

NOTE: A new dialog box will be shown for each sub-directory, as I didn't know how to get around this issue.