fix build with latest VS version
patch from Denis Kovalchuk (https://groups.google.com/g/tortoisesvn-dev/c/JismmKGrup8/m/fc5czE8fBgAJ)
cloak the main window when initializing to avoid flickers, uncloak it once it has been properly drawn
go back to REINSTALLMODE "dmus" to avoid overwriting newer c-runtimes with older ones
Fix piping to TortoiseUDiff by checking for ERROR_BROKEN_PIPE and treating that as ok
show the path in the dialog title
select the shelf specified via /shelfname in the combobox
handle help buttons in the settings dialog