[Bug #8513] Wrong pdf Activex detection fixed by using qx.bom.client.Plugin#getActiveX, which handles IE11 behavior of artificially hiding the ActivexObject

Furthermore detection of version for pdf Activex improved.
[BUG #8428] Remove all bindings on dispose.
[BUG #8486] first attempt to leaner qx.core.Environment usage in toolchain (i.e. without using _checksMap)
[BUG #8486] empty _checksMap temporarily
[BUG #8428] Added unit test
[BUG #8504] qx.Mobile List Group Header should be sticky
* Added a sticky mixin to common SCSS
* used that sticky mixin inside qx.Moblie List headers.
[BUG #8504] qx.Mobile List Group Header should be sticky
* Default to position static if sticky is not supported, for keeping sure "top" does not move all elements.
[BUG #8505] qx.Mobile Scroll container should fire momentumStart/momentumEnd event
* Added detection of momentum, and firing "momentumStart"/"momentumEnd".
[BUG #8486] remove unneeded method
[BUG #8486] enable _checksMap again
[BUG #8486] empty _checksMap again
[BUG #8468] dissolve pipe syntax within qx.core.Environment.select() calls
[Bug #8517] getAllBindingsFromObject returns all bindings even if the object is the target object. removeAllBindingsFromObject removes all bindings even if the object is the target object.
[Bug #8368] on qx.ui.virtual.layer.WidgetCell#fullupdate and #_updateLayerWindow  now only children who are not in use will be removed any more.
[BUG #7899] delete redundant method (in favor of qx.bom.client.CssTransform.get3D())
[Bug #8517] Explicit removing of bindings on destruct is not necessary anymore
[Bug #8521] qx.data.SingleValueBinding#removeRelatedBindings implemented. This function allows to release all bindings between two objects.
[Bug #8521] removeRelatedBindings() used on qx.ui.basic.Label#_applyBuddy
[Bug #8517] Binding related test changed
[Bug #8287] qx.ui.core.DragDropScrolling wrapps the mixin now to allow to apply the scroll on drag session behavior on any widget.