* build_win.bat: add RUN switch and other changes
* Adds optional RUN action after a successful build
* Adds some more error checking and status messages
* Fixes a bug where cmake wasn't run on dirty builds
* Fixes a bug in canonicalizing paths with spaces
* build_win.bat: Make cached destdir per-config
* Support relative as well as absolute paths in -d/-destdir
* Improved debuggability (control variables and echo suppression)
* Improved error handling and messages
Batch file that offers a single command line and sensible defaults to:
initialize the primary Visual Studio build environment, handle directory
creation/cleaning, run cmake, launch msbuild, etc.
