Fixes#3084.
This does two things:
1. Cleans up a bunch of places where we used to use `(int)` typecasts
for pointer math, which was problematic. We now use `(INT_PTR)` per
MSDN https://docs.microsoft.com/en-us/windows/win32/winprog64/rules-for-using-pointers
and then cast that down to `(int)` where necessary, e.g. when storing
string lengths which are never going to be more than a few hundred
characters! Doing this explicitly helps to clarify that we are aware
of the typecast and believe it to be safe.
2. Adds in some build infrastructure for future use of Coverity Scan
https://scan.coverity.com/ which we plan to use for further code
quality updates. I have submitted the project to Coverity and are
now waiting for approval so we can check results. Once we have
approval, I do plan to add this to the nightly build (we need to
keep submissions under 3 builds/day).
Note: I have not yet added Keyman Core (Windows) to this project,
nor are we currently building Keyman Core (macOS) or Keyman for
Linux, but we should consider adding those in future.
[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
