Streamline wxSocket code: wxSocketBase now uses wxSocketImpl (previously known
as GSocket) which is a base class with various wxSocketImplXXX implementations provided by different wxSocketManagers. Share more code between ports (still not finished). Refactor some code inside wxSocketImpl itself to be less redundant and fixed a couple of minor bugs in the process. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@56994 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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