Version 2.3.0.0 release

Features:
- HTTP-Server for status, settings with port
- free memory by GC
- let select to cache target directory structure
- add server in source selection
- calculate complete filesize
- show copied/to copy filesizes
- show transfer rate/copy speed
- memory usage improved
- many work of refactor
- settings: refactored to use XML und ProgramData

Bugs fixed:
- copy of long filenames on shares did not worked - fixed