Add codecov.io coverage collection from AppVeyor

Also had to add new project to redirect CTest output, add
separate batch scripts for AppVeyor because it doesn't handle
multi-line batch scripts in yaml properly, and other helper
scripts.

misc/appveyorBuildConfigurationScript.bat

@@ -0,0 +1,15 @@
+@REM  # In debug build, we want to
+@REM  # 1) Prebuild memcheck redirecter
+@REM  # 2) Regenerate single header include for examples
+@REM  # 3) Enable building examples
+if "%CONFIGURATION%"=="Debug" (
+  echo "buildConfiguration.bat thinks this is a Debug build"
+  python scripts\generateSingleHeader.py
+  cmake -Hmisc -Bbuild-misc -A%PLATFORM%
+  cmake --build build-misc
+  cmake -H. -BBuild -A%PLATFORM% -DUSE_WMAIN=%wmain% -DBUILD_EXAMPLES=ON -DMEMORYCHECK_COMMAND=build-misc\Debug\CoverageHelper.exe -DMEMORYCHECK_COMMAND_OPTIONS=--sep-- -DMEMORYCHECK_TYPE=Valgrind
+)
+if "%CONFIGURATION%"=="Release" (
+  echo "buildConfiguration.bat thinks this is a Release build"
+  cmake -H. -BBuild -A%PLATFORM% -DUSE_WMAIN=%wmain%
+)