* some major refactoring of classes and functions, so this can contain bugs
and therefor is a beta.
* verify file checksum after copy finishes, can be enabled/disabled in
settings or in the expanded task window.
* Now file and folder attributes will be copied.
-> so custom folder icons will be preserved too.
* the search functions in the file-tree is now a filter.
* NiceCopier can now be customized with a .css file, a simple example
comes with the setup. Can be enabled in settings.