[RAPPS] Bulk install!

[RAPPS] Bulk install!
- Added ListView class
- Added ListView to a dialog
  Dialog shows the install progress of individual apps. It also waits for an installator to finish before issuing another download-install cycle.
- Fixed: Downloads pointing to "\"
- Fixed: Selection data is not retrieved correctly
- Yet again replacing some macros to wide functions
- Minor improvements

svn path=/branches/GSoC_2017/rapps/; revision=75433