Update framework/source/class/qx/ui/form/VirtualComboBox.js

Correction to do a better support for empty selection
use download link for require.js
* Improved scrolling performance of Carousel
* Refactoring of Carousel. Replaced duplicate code fragments through "scrollToPage"-method
* Fallback for mobile widgets transform: translate3d() to translate() if "css.transform.3d" environment variable returns false.
[BUG #6914] Improved error messages with stacktraces whenever a queue is throwing an error.
[BUG #6916] Added URL to the error message.
* Carousel did not show CarouselPages under Windows Phone.
[BUG #6614] make the manual use local style sheets, fonts and .js files

- this is to make the manual offline-capable
- the files are copied from tool/admin/www/resources, so that Sphinx's build
  process can handle them
- the fonts/ folder is retained to maintain relative paths from .css files
- there should be an automatic deployment from there to the manual
  theme folders (with #6645)
- once this is in place, they can be removed from the git index
  (gitignore'd)
[BUG #6920] append the 'signature mismatch' message to the existing 'missing documentation' error
Fixed API docs.
[BUG #6928] Add a check whether the animation exists before the emit method is called.
[BUG #6296] more work on exception handler and Resource.py

- removed %r from exception handler, as it turns out that repr(e) is as
  bad as str(e) when __str__ and __repr__ are spoiled in an object
  involved in the exception
- fixed Resource.__hash__ to use id() instead of hash() (as this turned into
  and endless loop instead of falling back to the default hash() impl for
  objects); id() should do this trick
[BUG #6661] new approach: just move the classId check to MClassCode.tree()

- rather than working without a global class index
- produce the class index on the basis of their fileId's (in Library.py)
- and check the match between fileId (from file name) and classId (from
  qx.*.define) when first parsing the tree (in MClassCode.py)
- this delays the costly parsing of files until the trees are actually used
  (e.g. during deps.analysis)
- and hence limits this check to classes that actually go into the class list
  (ie. classes that go into the build)

- code.ClassList not needed for this
- but i'm leaving the code in, as a dict-like data struct with
  key-miss semantics (sort of dict-as-memoization)
[BUG #6929] Make qx.Mobile support IE10 


* Updated CSS/LESS
* Updated Indigo.
Update framework/source/class/qx/bom/element/Overflow.js

Minor update of a deprecation message.
[BUG #6860] Mobile tutorials only for supported browsers.
[BUG #6860] Include every qx file in the tutorial build.
[BUG #6860] Store the selected tutorial in the URL hash.
Make sure the VML class does not break any build in case it is loaded before the body is ready.
[BUG #6860] Moved the tutorial code to the HTML files to make sure they won't be optimized.