Draw Harness, ViewerTest - Incorrect handling of comma and period keys pressed in a 3D view

Under Windows, ViewerWindowProc() function in ViewerTest_ViewerCommands.cxx tries to process almost all keyboard shortcuts passed through wParam argument of WM_KEYDOWN message as if they are true human-readable string constants.
However, this is not the case for comma (,) and period (.) keys: wParam contains VK_OEM_COMMA and VK_OEM_PERIOD, respectively.

Thus pressing comma and period keys in a test 3D view has unexpected effect, and this should be corrected (virtual key codes should be translated to ASCII characters before further processing, or virtual key codes should be used for all keyboard shortcuts).