[MSGINA] - Do not hardcode buffer sizes in function calls, and use _countof when needed. - Use explicit unicode functions where possible. - No need to have 342687 versions of the shutdown dialog in msgina, only one is sufficient. The help button should be either shown or hidden, depending on whom is calling the dialog (shell or winlogon) (this is TODO!) - Therefore, no need to have twice the (almost) same code for the shutdown dialog. - Fix & rework said code. - The old duplicated shutdown dialog now becomes the "template" for the "Luna-XP-style Shut Down dialog" (implementation TODO!) - Reenable the WM_ACTIVATE code that was added in r72720 and temporarily disabled in r72721. CORE-7559 #comment Numerous fixes committed in r72732.