[GSoC] Improve user experience with CMIS – Weekly report #5

My work this week:

* improved accessibility: now we can access breadcrumb, folder tree and
file list with keyboard. The dialog still have a small bug: while using
tab + shift (reversed direction) file list is omitted.
* I added a type of service before it's name, like it is in the mockup
* created a subclass of the SvTreeListBox and moved tree's code to it.
Tree adds nodes in the RequestChildren method, not in the event handler.
When user goes into a directory in the files listbox or breadcrumb,
nodes are expanded.
* handled open button, double click on file
* Now the open button works and opening files is possible
* If auth fails during attempt to create a new service, error message
box appears
* some small fixes like decoding text in edit boxes, cleaning code

To do next:
* [from previous report] user should be able to change password after
failed authorization.
* async operations
* integrate dialog with FileDialogHelper, for example, in different
contexts dialog should be filled with the proper filters

Regards,
Szymon