[BUG #7273] Removed obsolete demo
ignore all dependencies to qx.dev.Debug
[BUG #7273] Fixed DOMException in IE
[BUG #7273] apply source and class to nested element if we've got a wrapper
[BUG #5548] re-org and more stuff for the config manual

- add "Branching" article from blog
- add new pages for configuration usage
  (this is actually about config semantics, but i wouldn't call it such)
- add new page about config tweaking (material from the tutorial)
[BUG #7424] Mobile popups now always centered properly
Minor unit test fix
[BUG #7425] Prevent initial visibility of NavigationBar
[BUG #7426] Form Renderer access to labels and rows
[BUG #7138] Allow disabling of dynamic theme change
Merge branch 'master' into rs_restmodule