[Windows] Debug logging and proof of concept tests for keyboarding support within metro-style apps

[Windows] More tidyup and robustness for metro app support - debug cleanup and serialization of input (not quite finished)

[windows] Refactor serialized input code when used with key event thread model

[windows] Add consistent precompiled headers for other projects

[windows] Merge console window test into metro support

[Windows] Tidy up work and identify additional TODOs for metro-style app support

[Windows] Ensure error case falls through to default hook processing for console windows

[Windows] Refactor shared memory into memory mapped file so we can cross 32-64 bit boundary

[Windows] Tweaks to C++ security calls and parameters

[Windows] Start refactor of SerialKeyEvent* classes

[Windows] Rename to SerialKeyEventServer (refactoring)

[Windows] Complete refactoring of SerialKeyEventClient class

[Windows] Further encapsulation and cleanup with 'interfaces' to reduce header pollution

[Windows] Complete serialization fix with move of modifier state management from client thread to server thread to guarantee consistency

[Windows] Replace atom-based keyboard switching with memory mapped file indexed to avoid security constraints

[Windows] Fixup Left Alt+Shift interaction with serializer

[Windows] Use Windows 8.1 SDK for test