LegacyApplication explicitly uses "reindeer" as default theme.
Extended AbstractTestUI to AbstractReindeerTestUI, that all old tests now inherit.
All new tests should be based on AbstractTestUI.
Also added AbstractReindeerTestUIWithLog for those that needed it.
Removed all found @Theme("valo") and used proper parent test class.
Change-Id: I0bb45850f3f1d39c6f78dac35dfa08acbad427ad
Replaced ComponentErrorHandler with generic ErrorHandler (#10231)
* Replaced AbstractComponent ErrorHandler with ClientConnector level error handler. Now uses the same ErrorHandler as other parts of the framework.
* Made error handling hierarchical so that the error handler of the connector where the error occured or its ancestors is used. Falls back to VaadinSession ErrorHandler.
* Changed ErrorEvent to be a class as all other events in the framework
* Renamed ErrorListener to ErrorHandler and DefaultErrorListener to DefaultErrorHandler for consistency
* Unified error handling in AbstractCommunicationManager
* Unified error handling in VaadinServlet and VaadinPortlet
* Removed superfluous ErrorEvent implementations (#10232)
Change-Id: Ied518e05209fe54685f4bebab0709b1cd5584fd1