Improved support for compiling with _ATL_ALL_USER_WARNINGS defined, better handling of warnings in WTL with defaults for user code

git-svn-id: http://svn.code.sf.net/p/wtl/code/trunk/wtl@582 4beafcb9-bf40-0410-b8f5-b741cf90ec0e
atlscrl.h: Added override of SubclassWindow() to CScrollImpl, CMapScrollImpl, CZoomScrollImpl, and CScrollContainerImpl, + refactored OnSize code

git-svn-id: http://svn.code.sf.net/p/wtl/code/trunk/wtl@583 4beafcb9-bf40-0410-b8f5-b741cf90ec0e
atlapp.h: Added functions to register and unregister generic window class for subclassing - namespace GenericWndClass

git-svn-id: http://svn.code.sf.net/p/wtl/code/trunk/wtl@584 4beafcb9-bf40-0410-b8f5-b741cf90ec0e
atlctrlx.h: Added BMPBTN_CHECK extended style to CBitmapButtonImpl for check mode, disabled BN_DOUBLECLICKED in check mode to be the same as Check Box

git-svn-id: http://svn.code.sf.net/p/wtl/code/trunk/wtl@585 4beafcb9-bf40-0410-b8f5-b741cf90ec0e
ReadMe.html: Updated build and date, added additional changes

git-svn-id: http://svn.code.sf.net/p/wtl/code/trunk/wtl@586 4beafcb9-bf40-0410-b8f5-b741cf90ec0e