Resolves#703 along with several other issues:
* Build an x64 MSI for an x64 executable. This means the binary is installed to C:\Program Files, by default, rather than C:\Program Files (x86) without the ability to redirect it to 64-bit locations.
* Environment change to PATH is not system-wide, which for a per-machine install it should be so all users who can access the executable have it in their PATH.
* Environment change to PATH is not cleaned up when uninstalled.
* RTF conversion of LICENSE was difficult to read. A simple conversion script is checked in to facilitate regenerating RTF from root LICENSE.
