Add wxIntegerValidator and wxFloatingPointValidator classes.

Add validators for integer and floating point numbers.

Add an example of their use to the validate sample as well as a new unit test
and documentation for them.

Use the new classes instead of wxTextValidator in wxGrid code.

Closes #12166.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@66714 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

tests/test_test_gui.dsp

@@ -517,6 +517,10 @@ SOURCE=.\controls\treectrltest.cpp
 # End Source File
 # Begin Source File
 
+SOURCE=.\validators\valnum.cpp
+# End Source File
+# Begin Source File
+
 SOURCE=.\controls\virtlistctrltest.cpp
 # End Source File
 # Begin Source File