wxWidgets3 builds broken SVN HEAD 13567

Both the wx3-Release/Debug configurations are currently broken:

Error	1	error C2440: 'initializing' : cannot convert from 'wxUniCharRef *' to 'wxChar *'	srcwidgetsNumericTextCtrl.cpp	1597	1	Audacity
Error	2	error C2440: '=' : cannot convert from 'wxUniCharRef *' to 'wxChar *'	srcwidgetsNumericTextCtrl.cpp	1603	1	Audacity
Error	3	error C2440: '=' : cannot convert from 'wxUniCharRef *' to 'wxChar *'	srcwidgetsNumericTextCtrl.cpp	1617	1	Audacity
Error	4	error C2039: 'GetTimeValue' : is not a member of 'NumericTextCtrl'	srcwidgetsGrid.cpp	86	1	Audacity

wx3 is not officially supported yet.

From the current README.txt file:

  1. Compilation instructions

First you must download wxWidgets. Audacity 2.0.6 requires wxWidgets 2.8.12

These are 2 configurations in the current experimental Microsoft Visual Studio 2013 Project which has built fine until today. Without pointing any fingers, something which was committed today cause these 2 configurations to break; I think all of these have to do with the new Spectral Selection toolbar. They should be trivial to fix; the Developers should be encouraged to build every configuration before they commit – this has been a perennial, though infrequent, problem.