Add wxInt64 support to wxText{Input,Output}Stream.

Add explicit Read64[S]() and Write64() methods.

Closes #14685.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76171 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Compilation fix in wchar_t build after r76171.

Don't concatenate narrow wxLongLongFmtSpec with wide strings, just don't use
wxT() at all.

Closes #14685.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76172 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Add wxOVERRIDE and use it in common and wxOSX code.

Make overriding virtual methods more explicit and enable additional checks
provided by C++11 compilers when "override" is used.

Closes #16100.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76173 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Remove configure test for override keyword.

Detect its support in the code by testing __cplusplus value and using specific
checks for MSVC and Clang as configure detects it as being available when
using recent g++ versions in non-C++11 mode, which do support this keyword but
warn when it is used without -std={gnu,c}++11 option, which makes actually
using it a bad idea in this case.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76174 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Use Doxygen @deprecated tags for deprecated methods.

Instead of just mentioning that the methods are deprecated in the
documentation text, use the @deprecated tag for them to make it possible to
detect it in documentation-processing tools too.

Closes #16102.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76175 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Mark some deprecated wxGrid methods as deprecated in the documentation.

Point people to the new names of the deprecated methods.

Closes #16103.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76176 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Put a __cplusplus guard around C++-specific tests in wx/defs.h.

This avoids the warning about __cplusplus being undefined in the recently
added wxOVERRIDE logic and make the existing wx_xxx_cast<>s definitions
simpler.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76177 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775