* Move to a postbuild.ps1 script and Set the working dir at runtime as output dir
* Update for 2f711d4
* Only copy newer files and remove needed files from gitignore
The Debug|x64 and Release|x64 configurations had no PostBuildEvent to
deploy sound assets alongside the executable. At runtime, SoundEngine
looks for Durango\Sound\Minecraft.msscmp and music\ relative to the
output directory, causing silent failure (no sound effects or music).
Add post-build xcopy steps for both configurations to mirror what the
Durango build already does.
