Use the same project files for all MSBuild-based MSVS versions.

Get rid of version-specific MSVS project files, we can reuse the same projects
for all MSBuild-based versions, i.e. 2010, 2011 and 2013.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77008 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Remove wx/unix/execute.h from the master list of files too.

This should have been part of r76683.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77009 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Add XRC handler for wxSimplebook.

Similar to wxNotebook but even simpler as wxSimplebook doesn't use images.

Also add wxSimplebook::Create() as the version inherited from wxBookCtrlBase
didn't _quite_ work: we need to add wxBK_TOP style to prevent asserts due to
unknown alignment in the base class when creating wxSimplebook.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77010 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775